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These white-crowned robin-chats columbuszoo! Birds are found all around the world, making their homes in all kinds of habitats. They vary tremendously in size, with the smallest species, the bee hummingbird, measuring in at just two inches long, while the ostrich stands at nine feet tall! Even though some species like penguins have lost the ability to fly, everything about the anatomy of most birds reflects the necessities of flight. Wings are shaped to create lift, tail feathers are used for steering, and muscles and bones are highly specialized. These incredible features have been evolving for millions of years; the fossil record indicates that birds evolved alongside dinosaurs during the Jurassic period over 160 million years ago!