because these squirrel monkeys are anywhere from 8.8- to 11.6-inches big though their tails can add 14-18 inches to their tiny frames. When you go to Costa Rica, you probably want to see sloths.

Alejandro Zúñiga / The Tico Times. Howler monkeys, native to Costa Rica, are increasingly threatened by human activity. Traditionally known for swinging from branch to branch using their tails, these ...