Image via WikipediaCan you identify a Bald Eagle by its call? What about other birds? Learning bird songs is a great way to identify birds hidden by dense foliage, faraway birds, birds that sing you awake in the morning, and birds that look identical to each other.
When a customer comes into the Wild Birds Unlimited store describing a bird song I immediately go to the Cornell Lab of Ornithology website: http://www.allaboutbirds.org/guide/search. This might have helped Conan O'Brien too.