At the biological crossroads of the Americas, Costa Rica hosts an astonishing array of plants and animals--over half a million species Ecotourists, birders, and biologists come from around the world, drawn by the likelihood of seeing more than three or four hundred species of birds and other animals during even a short stay. To help all of these visitors, as well as local residents, identify and enjoy the wildlife of Costa Rica, Carrol Henderson published Field Guide to the Wildlife of Costa Rica in 2002, and it became the instant and indispensable guide.

Now Henderson...