Archaeopteryx's strong ankles probably served as shock absorbers during landings. The bones comprising them were relatively long compared to those of related dinosaurs, and they were partially ...

Birds are vertebrate animals adapted for flight. Many can also run, jump, swim, and dive. Some, like penguins, have lost the ability to fly but retained their wings. Birds are found worldwide and ...

Few subjects in evolutionary theory have posed such intriguing puzzles for so long as the origin of birds. Evidence of avian beginnings has been elusive in the fossil record because birds' light ...