Baby Capybara Squeaking

For more information on pet capybaras, please see my blog at www.GiantHamster.com. In this video, Mudskipper Rous an 11-day-old male capybara is squeaking his little head off for no apparent reason.
Update: He turned out to be a she. Rodents are hard to sex. She is now three years old. She is a sweet capybara but very timid and skittish. She's up to 140 lbs.