Penguins swim and dive well, what adaptations have evolved in these birds in connection with their lifestyle?

1) the shape of the body of the penguins is streamlined, promotes active movement in the water; large feet with a swimming membrane;
2) penguins have a sternum with a well-defined keel, to which powerful muscles are attached; the muscles and structure of the bones allow them to work underwater with their wings almost like screws;
3) in penguins, bones are similar to those of mammals (dolphins and seals) and do not contain internal cavities;
4) a thick layer of fat (2-3 cm) serves for thermal insulation, above which there are three layers of waterproof, short, tightly fitting feathers and evenly distributed throughout the body

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