This common trait among diverse flying birds contrasts with the varying number of primary feathers in flightless birds, such as emus and penguins. Kiat adds: "It's really surprising, that with so ...

Birds wintering farther south, closer to the equator, potentially have a faster rate of feather degradation due to an increase in UVR intensity, but may live in a more benignÐ site in other respects.

Did you know that birds are evolved from dinosaurs. All birds lay eggs and they can look very different. They all have beaks, feathers, two legs and two wings. Most even have special feathers on ...

Birds have feathers and a beak and lay hard-shelled eggs. Many birds are able to fly using their wings, but others such as ostriches are flightless and unable to fly. Some birds like penguins ...