By far, the most heavily studied class of animals, birds offer much insight into changing environmental conditions (such as those influenced by climate change), based upon changing migration patterns, and their ability to quickly move from one area to another.  Birds have proven to be some of my most cooperative photo subjects, many of my favorites being those exhibited in this album, which is exclusively occupied by raptors (hawks, owls, eagles, etc.), and water birds (ducks, herons, egrets, etc.).