There are many birds that cannot fly. When we talk about birds, the ability to fly comes in our mind. We think of the height up to which the birds can fly. Many birds migrate during winter by flying for thousands of kilometers. But there are also many beautiful birds that are flightless due to some reasons. These birds develop other warp to get around and do not need wings. In areas, such as New Zealand, South America, where birds find food easily and have no natural predators, they do not need to fly. Not having wings or less developed wings, the bird develop better plumage comnflage, strong legs for running, specialized feet for swimming, which help them to survive.

Reason of flightlessness – In most flightless birds, the reason is the shape of their body, for example Kiwis, Ostriches, Emns, Rheas, and many more having flat breast bone lack the kneel that anchors the strong pectoral muscles required for flight. Their small wings cannot lift their heavy bodies of the ground. Also the theory goes that birds evolved to become flightless due to lack of predators where they lived. They do not have many enemies, so did not need to escape.

The flightless birds lost their ability to fly through evolutionary also. The well-known such birds are Emoeror Penguin, Dodo, Ostriches, King Penguin, Adelie Penguin, Gentoo Penguin, Little Penguin, Cormorant, and many more.

Thus, the reason for flightlessness can be shortlisted as

1. Loss of their ability to fly through evolution.
2. Abundance of food naturally.
3. The shape of their body and the design of wings.
4. Lack of predators and enemies in those areas.