Introduction: Whales and dolphins are the animals which are included under the order Cetacea of class mammalia. They come under the phylum chordata.
Habit and habitat : Whales and dolphins are found in all seas. Few of them also live in rivers and lakes. They are carnivorous and predaceous in habit. They are found to be swimming with great strength.
Structure : Body of these animals is fish -like and stream-lined. Scales are lacking. So, the body is naked. But a thick layer of fat is present below the skin in subcutaneous layer. It is also known as blubber . Nasal apertures are found on the top of the head region. Caudal fin or tail fin is expanded horizontally expanded. Their dorsal fin is fatty. They have minute external ear. But pinna are absent. Eyes are very small and are situated at the angle of the mouth. Their body size ranges from small five feet to hundred feet in length and about 150 ton in weight. Whales are the largest animals in the animal kingdom. They are even larger than the dinosaurs. These animals are descended from the land living ancestors and use to breathe air by coming to the surface frequently.
Habit and habitat : Whales and dolphins are found in all seas. Few of them also live in rivers and lakes. They are carnivorous and predaceous in habit. They are found to be swimming with great strength.
Structure : Body of these animals is fish -like and stream-lined. Scales are lacking. So, the body is naked. But a thick layer of fat is present below the skin in subcutaneous layer. It is also known as blubber . Nasal apertures are found on the top of the head region. Caudal fin or tail fin is expanded horizontally expanded. Their dorsal fin is fatty. They have minute external ear. But pinna are absent. Eyes are very small and are situated at the angle of the mouth. Their body size ranges from small five feet to hundred feet in length and about 150 ton in weight. Whales are the largest animals in the animal kingdom. They are even larger than the dinosaurs. These animals are descended from the land living ancestors and use to breathe air by coming to the surface frequently.
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