I have both local ones and The Audubon Society Feild Guides. I like the Audubon the best. They have color pictures as well as the information you need for a specific species. Sometimes we have birds come from all over the US so I like to know their flight zones ect. They put out books on Animals, Sea Creatures, The Night Sky, North American Birds,Spiders, Butterflies and Moths, trees, ect… I have several. I seem to grab some of those first. I have a feild guide addiction. Ugh! 🙂