? Penguins are recognized as cute animals. Most of them live in Antarctica and have strong ability to resist cold. Penguins themselves belong to birds and are animals in the bird class. Compared with many animals in nature, penguins are relatively advanced animals, so their body structure is more complex. There are many complex body structures, which play a key role in their life activities. For example, from the appearance, it is easy to mistake penguins for kneeless, because their bodies are covered by thick feathers, only their feet are exposed.
In fact, penguins have knees, and the structure of penguin legs is somewhat similar to that of human legs, which are composed of knees, femurs, tibias and other structures. When scientists studied penguins, they found that their knees were very obvious under X-ray. The penguin's knee structure can also play a role when they move, sometimes walking on the ice, sometimes swimming in the water, when the knee can play a role.
? As mentioned above, penguins have knees, but because their knees are covered by thick feathers, it is easy to think that they have no knees. It can be seen that penguins obviously have feathers, and their feathers are thicker. In fact, as a kind of bird, it is easy to understand that penguins have feathers, after all, other species of birds also have feathers, which is one of their common characteristics. The feathers of penguins play a key role in keeping out the cold. They live in the Antarctic region, and they can't keep out the cold without feathers. Moreover, the feathers of penguins also have a certain waterproof effect, when they swim in the water, they can also keep out the cold.
