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Find the main idea of the paragraph and give two supporting details.
Dolphins are mammals that live in the ocean. Mammals are different than fish, reptiles or birds. As a mammal, dolphins breathe oxygen, even though they live in water. Because they are mammals, a dolphin mother gives birth to a live baby, unlike reptiles and birds who lay eggs. A dolphin mother also feeds her baby milk like other mammals.
Dolphins are mammals.
Detail 1: A dolphin breathes oxygen.
Detail 2: A dolphin feeds her baby milk.