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 ...

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.