There are over 10,000 species of birds in the world. Some, like the bumblebee hummingbird, are very small. Others, like the ...

Flightless species of birds (such as ostriches, which are the largest living birds) tend to outsize any of the largest birds ...

Even though the ostrich is a bird, it can’t fly. Ostriches have wings, of course, but they are too small to support their weight. In addition, birds need keel-shaped sternums for flight ...