The primary attraction for many naturalists are the birds, of which some 850 species have been recorded. This is far more species than any one of the continents of North America, Australia or Europe. Here there are six different kinds of toucans, with their incredibly large and hollow bills.
For many visitors the hummingbirds are the most delightful birds to observe. Over 50 species have been recorded in Costa Rica. Hummingbirds can beat their wings up to 80 times a second, thus producing the typical hum for which they are named.