Flightless birds are birds that have lost the ability to fly through evolution. There are over 40 species of flightless birds live on earth. These birds have developed excellent skills for life on land or in water. Why did it happen?

It must be made clear that all species of non-flying birds that exist today are descended from ancient birds that had the ability to fly. This means that they lost their ability to fly because at some point they had to adapt to their environment in order to survive.

One of the reasons some of these species lost their ability to fly was the lack of predators in their habitat. This is the reason why most species of flightless birds live on islands far from the mainland, such as New Zealand, where there are no predators. Over time, flights have become less frequent and unnecessary, as they require a lot of energy.

Another reason has to do with the fact that some species were greatly reduced in size in prehistoric times. Then they evolved to be larger to take advantage of the new prey found in their habitat. However, as they got bigger, they became heavier, which made flying more difficult for them.

Below, we will show a list with 5 popular birds that do not fly:

1. Penguin

All 18 species of penguins cannot fly. Although they do not use their wings to fly, they are excellent swimmers and have a technique for gathering air around their wing feathers to propel themselves out of the water when they urgently need to reach dry land. 

And yet, penguins are very romantic and season after season they look for the same partners among hundreds or even thousands of birds that live in colonies.

2. Ostrich

It is the largest and heaviest bird in the world. Ostriches can grow up to 2.5 meters in height and weigh over 130 kg.

Since they cannot fly, they have strong developed legs and can run up to 90 km/h. During the running, wings help the ostrich make out the revolutions, and also serve as an obstacle to stunning the blows of predators. Ostriches also use their powerful legs to kick other animals and to defend themselves.

3. Emu

Emu is a large flightless bird native to Australia. It is the tallest bird in Australia and the second largest in the world (after the Ostrich). Emus have short wings and long legs, making them exceptionally well adapted for running. They increase higher speeds on the ground and can run for longer distances using their long legs instead of flying.

4. Kiwi

Kiwis are small birds native to New Zealand. They have tiny wings that barely develop, and their inability to fly due to their heavy bones and low concentration of muscles. Kiwis prefer life on the ground and are masters of stealth, spending much of their time looking for food.

5. Rhea

Rhea is a flightless bird that looks like an ostrich. It is native to South America and feeds on seeds, insects, and various reptiles, including snakes. Like the ostrich, the rhea is an excellent runner, capable of reaching speeds of up to 80 km per hour. This species hardly jumps, but at the same time it is excellent at swimming.