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Penguins are a group of aquatic birds, which cannot fly, and live exclusively in the southern hemisphere.Acvo terrestrial mammals are living on the frozen continent called Antarctica. These flightless birds catch their food by swimming and catching fish in the mouth that then 
devours him. Their wing bones are fused to form flipper-like limbs and enable the birds to dive and swim with great skill. Penguins have long bills that are laterally narrow.

Penguins are a group of birds that includes six subgroups and about 18 species. The most diverse of all penguins are the crested penguins. penguins classification, penguins struthioniformes, penguins passeriformes, penguins gaviiformes, penguins procellariiformes .