Penguin is the animal that we all compare familiar, they live in very cold high latitude area. According to the category to which penguins belong, they are animals in the phylum Chordata, class Aves, order Penguin and family Penguin. Therefore, they can be birds. Many people think that penguins belong to birds because they can't fly. In fact, penguins are a special kind of bird, a kind of bird that can't fly but can swim, that is, swimming birds. Moreover, penguins are a group of swimming birds with a long history and very old, and they also have a nickname called "boat of the ocean".
Penguins have a strong ability to swim, and with this ability they can prey on a variety of animals. From the point of view of feeding habits, penguins are a kind of carnivorous animals, they can prey on small fish, krill, squid and so on.
As mentioned above, penguins belong to birds, so they are a kind of birds. Many people may think that penguins belong to mammals because they can't fly, but this is actually a wrong view. As birds, penguins must not be mammals, because birds and mammals are not intersecting, they are two different animals. Moreover, some key features of penguins are not mammalian characteristics. For example, from the point of view of reproductive methods, mammals generally use viviparous reproductive methods, and generally have lactation, but penguins are oviparous.
