Did you know that there are some birds that can swim and fly? Did you also know that birds are descendants of a group of dinosaurs called theropods? Theropods are characterized by hollow bones ...

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 ...

To maximize efficiency underwater instead of in the air, penguin wings are shorter and flatter than those of flying birds. The animals can adjust swimming posture by active wing feathering ...