In the fauna of Costa Rica there are 250 species of mammals. There are 23 aquatic species, of which 21 correspond to cetaceans, one to a marine carnivore and the other to the manatee. The rest, 208 species, are purely terrestrial.

Four species of monkey are native to the forests of Costa Rica and all of them are in the Osa Peninsula. At the Tamandua Station we have 3 of them: Spider monkey, White faced monkey and Howler monkey.

Almost half of the mammal species in Costa Rica are bats, we have 114 species, seven are at risk and four are listed as threatened. These are very important animals because of the environmental services they provide. They are responsible for controlling pest populations in important crops, or disease-transmitting insects for humans, such as mosquitoes. Some species feed on flower nectar and transport it from one flower to another, achieving pollination and reproduction of several plant species. Fruit-eating bats disperse seeds, a key process for forest regeneration.

Wild cats are common species that we normally see through our camera traps.  In the Osa Peninsula there are 5 species of wild cats, all have been registered within our property.

Around our garden is normal to see agoutis, coatis and tayras during the day and kinkajous at night. Tapirs are moving around our trails as well as many other mammals during the darkest nights. 

If you are quiet enough it is possible to see the shy river otters around our river where they eat river shrimps.