Whales are the largest animals that exist. They belong to a group of marine mammals that breathe air through their lungs and give birth to live young that feed on mother's milk. They have excellent hearing, whales are believed to have evolved from four-legged land mammals. Now, they are perfectly adapted to an underwater life.
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Whales are the largest animals that exist. They belong to a group of marine mammals that breathe air through their lungs and give birth to live young that feed on mother's milk. They have excellent hearing, whales are believed to have evolved from four-legged land mammals. Now, they are perfectly adapted to an underwater life.