Wood storks stand 2-4 feet tall, and have wingspans as wide as 5.5 feet. They are mainly white with a black tail and black feathers under their wings. Their heads are bald. They have no muscles attached to their voicebox, so they are very quiet, occasionally croaking like a bullfrog or hissing like a snake. Breeding season is timed for when wetlands dry up. When lakes start to dry and shrink, the fish have to congregate in smaller ponds, making them easier to catch. Wood storks are an endangered species, nesting high up in cypress trees in wetlands in the southeastern United States.