What features in the structure and physiology of crocodiles allow them to lead a semi-aquatic lifestyle?

1) The body of the crocodile is elongated and flattened. The tail is compressed from the sides and performs the functions of a rudder and fin in water. The hind legs have swimming membranes.
2) The eyes and nostrils are located above the water surface
3) Breeds on land. The eggs are covered with a calcareous shell.
4) It feeds on both aquatic and terrestrial animals

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