The world’s largest mammal is the blue whale. True or false？
Mammals are animals such as humans, dogs, lions, and whales. In general, female mammals give birth to babies rather than laying eggs, and feed their young with milk. 哺乳动物
Whales are very large mammals that live in the sea. 鲸鱼
Differences between Shark and Whale
Sharks are fish and cold-blooded, whereas whales are warm-blooded mammals. Sharks have a cartilaginous skeleton, but it is a bony skeleton in whales. Whales are generally larger in body size than sharks.
How large is a blue whale
Blue whale, (Balaenoptera musculus), also called sulfur-bottom whale, the most massive animal ever to have lived, a species of baleen whale that weighs approximately 150 tons and may attain a length of more than 30 metres (98 feet).