Birds are the most specialized group of vertebrates on the
planet. They are unusually heterogenous for a class level group
of organisms, meaning that they are all very different from each
other while still being in the same class. Birds are bipedal,
meaning they walk on two legs, and they are also homeothermic.
Birds are characterized by their feathers, hollow bones, four-
chambered hearts, and specially designed lungs. They have a
streamlined body and centralized weight specifically designed
for flying. They have extremely strong flight muscles and
tendons. Birds range from being herbivorous(seed and plant
eating birds, such as sparrows), to omnivorous(birds that eat
both plants and animals, such as turkeys), to carnivorous(meat
eating birds, such as eagles). Birds also have very sharp
vision, which they use to hunt for their food. Birds also have
feathers, which they use for flying, attraction, and to keep
warm.    Dinosaur Characteristics     Bird and Dinosaur Quiz