I don’t think capybara will beat cats as the favourite animal on the internet but probably just because they seem so utterly chill and therefore not very active.
(Youtube)
The best comment to the video above is this description of the animal:
It’s as big as a dog, has the mannerism of a cat, and the temperament of an apple.
For instance, what happens when a predator tries to eat a baby capybara that is clearly too big for it:
(Youtube)
I also agree with the attempt to make the collective noun for a group of capybara a meditation. If you are interested in true and invented collective nouns in English, see this video from Rob Watts:
(Youtube)
Henning's blog 