Ostriches, emus, cassowaries, rheas, and kiwis can't fly. Unlike most birds, their flat breastbones lack the keel that anchors the strong pectoral muscles required for flight. Their puny wings can't possibly lift their heavy bodies off the ground. read more
There are quite a few reasons why some birds can't fly. Here are a few: they could be too heavy. Their wings could be too small. They could have just adapted to their environment. read more
Flightless birds still have wings, but their wings are typically smaller or less fully developed than birds that fly. The feather shapes may be different, such as looking fluffy like fur or being tiny and compact for insulation while swimming. read more
No list of flightless birds would be complete without the penguin. All 18 species of penguin are unable to fly, and are in fact better built for swimming and diving, which they spend the majority of their time doing. Their short legs and stocky build give them a distinctive waddling walk. read more