We have three different leucistic Chickadees coming to our feeders. This one has two pure white feathers on the right side of its tail. Leucistic birds are quite rare. Project Feederwatch, sponsored by Cornell Lab of Ornithology, says they have about 5.5 million birds reported each year. But in seven years (2000-2006) they had a total of less than 1000 leucistic birds reported. That would be only about 1 in every 38,500 birds, and we have three at one time.