Penguin (scientific name:Spheniscidae）: is a general term for all species in the bird class and penguin family. Penguins, known as the "boats of the ocean," are one of the oldest waterfowl and are likely to have settled in Antarctica before putting on ice armor on Earth. Penguins all over the world share18Most species are distributed and live in the southern hemisphere. Characterized by the inability to fly; Generally speaking, the legs and knees of a penguin are hidden in its belly, and its feet are located at the bottom of its body; When a penguin stands on the ground, its patella gets stuck at the joint between the femur and tibia tarsal bone, stabilizing the knee joint. It can also be used to position and fix the femur and tibia tarsal bone; There are fins between the toes; Plantagenesis (other birds land on their toes); The forelimbs are fin shaped; Feathers are short to reduce friction and turbulence; There is a layer of air left between the feathers to keep them warm. Black back, white belly. The main differences between each species are head color and individual size.