Hiking/birdwatching in the Cloud Forest Reserves – This is what Monteverde is famous for. We recommend guided hikes, because guides know the trails and where to find the animals. Early morning hikes are best because the birds and wildlife are more active. Monkeys, birds, and other mammals can be found at Monteverde. Two-toed sloths like this one are primarily nocturnal. Costa Rica has 5 sloth species divided into two categories: two-toed and three-toed sloths. Sloths are solitary and slow-moving creatures. Because their diet consists of leaves, they have slow metabolic rates and low body temperatures. A sloth will change trees only once every two days on average.