The Shark That Eats Seagrass
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- čas přidán 17. 07. 2024
- The smallest hammerhead, the bonnethead shark, is neither a lover, nor a fighter. They can reproduce on their own and would rather eat seagrass than a swimmer.
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Sources:
www.aquariumofpacific.org/onl...
science.fau.edu/shark_lab/sexu...
www.journals.uchicago.edu/doi...
royalsocietypublishing.org/do...
phys.org/news/2018-10-vegetar...
www.science.org/content/artic...
link.springer.com/article/10....
academic.oup.com/bioscience/a...
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I have never heard of these before but they are exquisitely friend-shaped and IMMEDIATELY my new favourite sharks. I can't wait for my pin.
They are great. But it is hard to beat the whale shark.
Whale sharks are huge, hard to feed, can die if they don’t get enough oxygen or space, oh also it’s illegal to own whale shark pups
Very tasty
Never gets pinned*
@@NOTTHEMUTANTMOBo He's talking about the enamel pin
When I worked at an aquarium, we actually had bonnetheads in a (monitored, don't worry) touch tank. One of my favorite things to do was stand by maligned species' tanks and dispel myths, and this was a great opportunity to do that. The only time I heard of anyone getting bitten was when a handler was feeding them and had her hand cupped rather than flat, and her fingers got a little nommed. Not the shark's fault, and she was fine.
I would stand by them and give them pets too. The baby talk would be intolerable, but I would not regret it.
Petting sharks is SO much fun. I was already a nature nerd when I first got to pet one as a little kid, but being able to interact with animals in a hands-on way can really help encourage people to learn more.
I've gotten to pet some very cute bamboo sharks at a local aquarium. They're adorable and I'll never understand why people are so afraid our happy tooth scaled friends.
Glad she is fine.
Oh that would be a DREAM for me. I love bonnetheads, and have seen some in the surf when at the beach on a calm day but not recently.
"Shark infested water" = "Human infested city"
For real tho lol it’s the sharks house
Human infested city = Rat + Roach Infested City 🤧
@@tavariswilson3361 I was saying that that's where the sharks live.
@@jansenart0 I got that me too
@Lind Morn Edgy.
All sharks deserve all the hugs and head pats. The bonnethead even more so. Just love them.
ehh headpats, maybe. but hugging dentin seems like a bad idea.
@@alveolate There's a trick or two: No exposed skin and only light hugs. I'd try in any case.
Pats yes hugs no
@@teathpaste3301 your right
Why? For what? What did they do to deserve love lol
Adding on to this, consider the vast gulf of time which sharks have existed on this planet. There could have been thousands of omnivorous and maybe even herbivorous species
400 million years is a very large window for possibility 🦈😎
I can only wonder what the planet could be like if a giant rock from space, and the volcanic winters right that occurred after that didn't happen.
>90% of all aquatic species is a lot to lose in a mass extinction, there were definitely niches that were once occupied but are no longer because of the hard reset of species.
sharks are older than trees
My amateur-self recalls an ancient lineage of omni- if not full on herbivorous sharks that existed IRRC right up to when the bony fishes took hold... or... I doubt they survived the Great Dying of the Permian-Triassic Extinction Event either way...
it wasn't mentioned in the video, but Zebra Sharks have also been known to exhibit parthenogenesis. it was first observed in a Zebra Shark kept at Reef HQ Aquarium in Townsville, Australia, but a similar event occurred again at the Cairns Aquarium, where the cloned sharks are on display, where I was able to see them when I visited. very cool! the aquarium staff did say that eggs produced via parthenogenesis are only viable about a quarter of the time, so most eggs the Zebra Sharks (they have two adult females) laid never hatched, but two did!
can't help but wonder if parthenogenesis in these sharks are a physiological response to resource shortages, stress, or even lack of companions...
Cool!
Could it be that they store sperm cells? Can't remember what animal it was, but I've heard of it somewhere....
@@w13rdguy some animals can do that, yes. for example, guppies and platies can store sperm. but that wasn't what happened with the zebra sharks. it was at first suspected that it was sperm storage, but dna testing showed that the zebra shark pups were genetically identical to their mother
@@alveolate Getting pregnant when resources are low and stress is high sounds like a completely senseless trait.
Especially when most of the offspring aren't viable, that seems like a terrible waste.
It might be a response to abundant food without predators/competition, but no available mates.
When I was a young lad I lived on an island, we would make big rock circles in the shallows and put fish we caught in them along with crabs and stuff. We used to have a "pet" bonnet head shark who would frequent our dock and we feed small fish. Oh the simpler days
the timeless experience of clicking on a video from a channel you've never seen before only to once again be pleasantly surprised by the voice of hank green
Lol, I just had that experience and then saw your comment. So it's not just me that wasn't aware of this channel at all, let alone its association with our favourite kind of Green. The Green Bro.'s are taking over (have already taken over?) youtube -- or at least the corners of it that I lurk in -- and I am totally alright with this.
@@iprobablyforgotsomethinglol it’s so perfect that i see this reply on a 2 year old comment i made as i’m watching a hankschannel video
That stingray straight up killed Shark Jesus. I hope they named the stingray Pontius Pilate.
Obviously not its fault. Was washing its fins before, during and after.
Yep. Still the best series on CZcams. Also, I LOVE this pin. I can't wait to get my cute little shark fella!
You're getting one as a pet?
@@chisaquaticvibe6524 If only!
I caught two of these at South Padre island I let them go though but, it's true they are in the gulf
I have never wanted one of the Bizarre Beasts pins as much as I desire this one - look how cute!! Brilliant work by the artist!
"Twice as good at it as pandas are at digesting bamboo."
That's pretty low standards there and not saying much, pandas are so bad at their job _we_ could probably digest bamboo easier than they can.
Not only do these sharks have a non-threatening size to them, their shape is also quite docile in a way!
I also love that super adorable, harmless sounding name. "Bonnethead", like an old-timey baby wearing a bonnet, it's just so cute to think about!
My favourite shark! I wish more people knew about them, they're so cute!
hopefully people leave well enough alone with these little guys so they can evolve into big cow sharks
The four lineages of sea grasses are super cool too. One even evolved vivipary. IN A PLANT.
Also, it is weird cetaceans don't regularly eat sea grasses, being ruminants, when animals not even slightly adapted to it managed to evolve it pretty easily.
My guess is that cetaceans generally hunt in open waters, while some shark species are bottom-ish feeders(like the bonnethead). So the latter would be in contact with and even unintentionally eat seagrass more often than the former, leading to bigger benefits when a mutation allows them to make use out of eating seagrass.
@@christiancinnabars1402 Some cetaceans do hunt in seagrass areas though. It is kind of inevitable as cetaceans are all over the place and sea grass meadows are in a lot of places.
@@christiancinnabars1402 Kind of impressive land plants manage to outcompete old lineages like coral and kelp. Angiosperms are pretty impressive and depending on your beliefs very intelligent. So it makes sense for them to be the ones that do it.
I'm pretty sure coral aren't plants.
@@fmlAllthetime They do grow by photosynthesis though, so they compete with seagrass.
This is the pin that finally got me to sign up for the pin club. He's so friend shaped.
Friend shaped! That’s the cutest thing ever!
Great video, as usual! It's funny (not really) how we do not see our own behavior as predatory, but are all up in arms about animals just trying to survive. Yeah, some species of sharks eat other animals, but they need to eat like everything else. And the ocean IS their home. Where are they supposed to go?!? We are the ones infesting THEIR home and not vice versa.
Exactly! We're the species that kills excessively, not them!
Whenever I see "shark infested waters" I think, y'know there sure are a lot of human infested houses around here.
@@selachian6799 I mean, yeah we kill way more than sharks do by any measurement but when you adjust for population size then dolphins, other great apes, and small cats beat us out. Tbf humans are omnivores and most can go vegan with some planning after puberty, while cats are outright obligate carnivores, and the others also require more meat than humans, so it’s kind of more necessary for them- though, like, humans still have to kill a lot of life forms for our agricultural practices even if everyone switched to just plant-based, which could actually lead to more animal deaths (in addition to the deaths of humans with allergies and other stuff) if done too quickly.
@runeanonymous9760 -- "humans still have to kill a lot of life forms for our agricultural practices even if everyone switched to just plant-based, which could actually lead to more animal deaths"
.
Thank you! Nobody ever thinks of this. We could end up pushing animals even moreso out of their territory to build our now-everyone-is-vegan-lifestyle farms PLUS compete with some animals for the same foodstuffs when before they didn't have that competition (or not so much) because humans ate more of other things. *And,* in places where land is scarce, poor quality, or buried under snow, there is no way for people to realistically (or inexpensively) support a totally-vegan lifestyle.
.
What we need is (1) to stop wasting food;
.
(2) manage our lands responsibly (ex. veggies would have more nutrients and be more satisfying if we rotated fields to let soil nutrients be replenished, instead of greedily harvesting every last penny's worth of gain, so we'd actually eat less and feel full);
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(3) and mandate ethical treatment of our farm animals (stuff like force-feeding animals to create specialty foods like -- wth is it called, le foie gras or something? liver, basically -- should flat out not be allowed, it's horrifying).
"Well they came into our bit...of the ocean"
"You see that bit? That big wet bit? That's their bit."
"you can eat all kinds of things that don't actually do anything for you, nutritionally." Me and chocolate...
but chocolate contains fats, carbohydrates, iron, antioxidants, calcium, protein and a bunch of other nutrients in it. Some chocolate is actually a healthy (ish) addition to your diet.
@@Jane-oz7pp Very true! It just sounded funny to me. But I completely agree. :)
2:25: here's a question i'd never thought to ask: how do you collect shark poop? I can't imagine it being solid, but i could be wrong.
i mean at least this shark eats grass so i has fibers to make the poop like... cohesive (?)
Most of the feces is liquid, but there are solid chunks in there.
Why would it NOT be solid? After all, people, dogs, cats, snakes, fish ( keep large plecostomus and it collects in the calm spots), birds (well, mostly), lizards, well most all animals really, put out solid poop. Why not sharks.
@@keithfaulkner6319 Shark poop is not solid, kind of cloudy, they live underwater
@@keithfaulkner6319 Having watched a whale shark empty its bowels while at the Atlanta Aquarium, I can say Selachian is correct. It's not solid.
UPDATE: the pin club will be open a whole extra week! You can subscribe anytime before May 16th, 2022 here: store.dftba.com/collections/bizarrebeasts
What's fascinating to me about the grass eating is how well it shows the coincidences involved in evolving new traits. Hank mentioned the sharks having grinding teeth for eating shellfish. Just so happens that those are good for eating plants as well! The shellfish live around and get eaten with the seagrass meaning that sharks will already associate seagrass with food to some extent and will have a lot of opportunities for any herbivory-supporting adaptations to provide an advantage. Heck, maybe that head shape dimorphism is related to diet: that smooth front might provide better electroreception for hunting prey. Females may need more prey compared to males on order to produce pups (sorta like male cs female mosquitos.)
Follow-up question: what do the bonnetheads' guts look like? I don't know if fish have the same sorts of specialized structures for herbivory that mammals do (EG: enlarged caecum). Assuming there are differences, have the bonnetheads evolved those changes yet? It'd be interesting to see how new this evolution is.
TLDR: this was a very thought provoking episode, as always. Great work!
Yall are reeeeally tempting me with this one!!
I was wondering if this channel will ever have a sister channel focused on plants? There are many peculiar plants out there in the world like the elusive yellow berry that is minimally radioactive. Plants are all around us but some plants are so unique you question how evolution managed to produce something so peculiar.
The prayers have been answered!!!! I’ve been dying to join! And what a Cute Little Face!
a porphyrio porphyrio is more bizarre!
0:56 - I'm curious how they ended up on coasts on both sides of central America, but not far north or south of that. I can't imagine they would've stayed as one species if they crossed over before the isthmus of Panama closed, that was several million years ago. Did they used to be on one side but got through the Panama canal somehow, or otherwise brought over by human intervention? Do some of them occasionally swim far enough to go around Cape Horn?
I just searched google and it told me there are more than one species of bonnet heads so maybe the species diverge since the isthmus of Panama is closed.
@@MarcellusJasonClay source? All I could find called them one species (sphyrna tiburo) with a range on both sides
@@DracarmenWinterspring i saw a picture of a scalloped bonnethead and bonnethead as an image. Idk how to screenshot image into a youtube comment tho.
@@MarcellusJasonClay well, the slightly different name is a good start. Looking that up, according to Wikipedia it's a different species in the same genus that lives only on the Pacific coast, but it is not omnivorous. It's possible there was some confusion between these two when listing the range, but doesn't look like it. I haven't dug deeper than the Wikipedia pages, though.
How did I only just find this channel 😱 looks like I've got some backlog to watch. Loved the video and loved the bonnet head ☺️
SO EXCITED TO FIND THIS VIDEO!!! Bonnethead sharks are one of my favorite species, great to see someone talking about them :D they're so cool!
I truly love this channel :)
Its amazing how a usually-carnivorous shark actually eats some plants. And the fact you uploaded this on May 6 is cool also because that is the birthday of my friend (who is a shark lover). We honestly thought all sharks eat meat, but I guess this is an exception.
So it’s the only shark where females and males have a different head shape, and there is just one version of the pin. Missed opportunity:(
This shark had me subscribing to the pin club, SO CUTE!
Oh my god I want that bonnethead as a tattoo, its adorable!
Ngl I've just found the channel and just glad to find more hank green I've been watching scishow and crash course for years
This is possibly my favorite pin design in the history of Bizarre Beasts. ❤️ ❤️ 🦈
This video popped up on my recommendations and I did not expect to see a Hank Green in it. Always a pleasant surprise
Glad to have found this channel :)
Never heard about them before, learning something new this day, thanks Bizarre Beast
the ocean abounds with fearsome creatures, but none attacks its prey with more fury... THAN THE SEAWEED SHARK!!!!
the struggle... is soon over...
These stingray keep getting away with murder
"stupid focking shark bonnet..." -- some tiny, angry pirate man
Oddly enough when it comes to the ocean, I'm more surprised when a plant is actually a plant and not another animal copy-catfish.
2:42 Just like that, another roast to how bad Pandas live.
Pandas are cute, but it’s like they’re asking to go extinct!
Great channel! Subbed
I'm looking forward to watching this soon
I have to say though, I've seen it in my stream for a few days and today is the first time I actually read the thumbnail correctly as "Bonnet head," as opposed to the bonehead I've been seeing.
The oceans abound with fearsome creatures, but none attack their prey as ferociously as the seaweed shark!
I’ve been wanting to subscribe for a while now - but this shark just sold me! Immediately grabbed my wallet and filled out my info. Can’t wait to get them in the mail
Sharks are fascinating creatures. This was a great Bizzare Beasts video, very interesting.
Thanks for letting me know about this unique shark, i didn't even know this species existed!
I can’t believe I didn’t know about these! Very cool.
YAAAASSSSS!!! As soon as I saw the preview on Instagram, I was hoping it was this shark!
Bonnethead shark: you see I'm built different
Most intriguing!!!
I must’ve been under a rock because I JUST found out about this channel and the pin club! I’m signing up now! I have a problem 😅
Sharks are so cool
All animals are cool
Been my favorite shark for years jus cuz 'shovelhead', one of their nicknames, is also a nickname for a social caste of vampire from the Vampire the Masquerade pen n paper roleplaying game. Now even more cool reasons to love em! oOo
I cought one of these before, never new they eat seagrass
WOW! I learned some cool things today, thanks! ♥️🦈
Wasn't expecting to be surprised by Hank Green, but this is a pleasant surprised
I wish I could buy the pins I want instead of signing up to a subscription service and hoping I get lucky with the colour.
Yeah :/ like on one hand, subscriptions help the charity more, and getting anything like pins at all is nice. But otoh, loot box style can be both a draw and a detriment.
It seems beating pandas in almost any evolutionary metric is easy for almost any animal
Oh wow.
These are surprisingly unique creatures, seems capable of adapting even more than other sharks.
😄👍
Interesting topic🦈
I see these all the time around home, they adorable
awesome video
First pin I wish I had. Got a bonnethead plushy sense I was a kid. Didn’t know about the parthenogenesis, neat.
I love hammerheads in general. The bonnethead and winghead are my favourites. The two odd extremes of these specialised sharky friends.
We can just say that this Bizarre Beast has a history that went awry
It’s always absolutely wild when I randomly stumble upon one of the Green brothers in something I had no prior knowledge was remotely related to them
Aw man! Missed the window! Those little shark pins are SO cute though!
🥺🥺🥺
I saw this just a day too late to subscribe! :( Will there be a chance to get a pin like this in the future? Also I've loved bonnetheads since I first heard of them and their grass eating, but the parthenogenesis fact was new to me! They are amazing :D
Bonnetheads are the cutest sharks I've ever seen. They are so smol
That's cool they actually show dimorphism. That's really cool.
It’s so funny, I JUST designed hammerhead shark stickers including a bonnethead! I did light research and there a 9 (or 8 it’s been a couple weeks since I looked it up) species of hammerhead, unfortunately every single species is endangered. Hopefully people will learn more about these sharks and more actions can be made to protect them
The strangest thing about parthenogenesis is that there is a species of lizard that reproduces entirely through parthenogenesis, with no males and all members being genetically identical
This is so freaking amazing!?!?! I love them now
Jaws has so much to answer for.
they’re head is perfectly shaped for patting the top of their head
Can you do tests like we do of teeth in humans to determine their diet? Would that show if they are true grass eaters only, or sometimes they have a mixed diet of crustaceans and other things that dwell in the habitats of their sea grass environments? Also, with the female giving birth, is it possible to have traits where the shark is able to store and delay reproduction? I think I've seen something about other animals being able to do something like that, I maybe explaining it incorrectly, but it's essentially storing reproductive material for later use.. let's put it that way... Either way it's all facinating and when this video started I thought you were talking about a past existing shark not a currently living one so that's awesome! I wonder if they still have the sensor arrays on their heads like hammerheads even tho they don't hunt because if they eat grass they wouldn't need to be able to sense where living creatures are due to electrical impulses and stuff.
This makes me think of pandas. Carnivores? No thanks, I’d rather have a salad
peace was always an option -bonnethead shark probably
4:18 Stingrays have started a competition with dolphins for the "assholes of the sea" crown, I see.
This has been my favorite shark for a while. :D
my local aquarium had bonnetheads for a bit theyre so cute
Yeah! An episode on the cutest-weirdest best shark!
Saw one right under me in super shallow water kayaking in Tampa bay. Then my kayak sank and I was a bit worried his big cousins would be up for a snack.
Cool video!
2:10 i love this little guy's face
so the females have heads like Toothless and the males have heads like Stitch. That's awesome
This needs to be a new Pokemon.
Really interesting video
Yo this the Same guy as The One In Crash Course- *Count me subscribed*
First found out about plant nomming spiders, and now sharks.
Was shell hunting in Florida on vacation and the opportunity to meet one of these in person
Although he was probably more curious while I was more terrified of a shark shaped blob to my left under water
Omg rarity variants!? I want the rare/uncommon so bad xD gonna buy 3.
Just tagged my first bonnet head for research today 🎉🎉
very cool sharks! I definitely assumed all sharks were strictly carnivores
I find this super interesting because I do quite a bit of fishing and use live shrimp and end up catching them a lot and I would have never guessed they ate sea grass
6:06 now that you bring up giant pandas. They actually remind me of bonnetheads.
rip Stede Bonnet you woulda loved Bonnethead sharks
Ooh it'd be really cool if y'all did an episode about the Tarpon fish!
Shovel sharks the name is right there
New favorite shark unlocked!