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Primary school mathematics (classification) Do penguins fly in the sky or run on the ground?
Running on the ground, of course.

At present, there are 18 species of penguins in the world. Characterized by inability to fly; Feet are born in the lowest part of the body, so they are upright; There is webbed toes; Foot flexibility (other birds land on their toes); Forelimbs have fins; Feathers are short to reduce friction and turbulence; There is a layer of air between the feathers for heat insulation. The back is black and the abdomen is white. The main differences between species are head color and individual size.