The Capybara is an EXCLUSIVE pet that could be hatched from the Exclusive Pets Egg (called the Exclusive Capybara Egg). It has a 50% hatch rate and was released in the Hardcore Anniversary Update during July 2022.
The latest Pet Simulator X value list for Capybara can be found below:
💎 7,000,000,000 (7b)
💎 28,000,000,000 (28b)
💎 140,000,000,000 (140b)
💎 Not Available