Whose observations first helped establish that whales are mammals, not fish?
Quick Answer
Aristotle made early distinctions among marine animals, but modern classification of whales as mammals is associated with later zoologists such as Carl Linnaeus and comparative anatomists. The crucial evidence was that whales breathe air and nurse their young.
The Full Story
Whales were long known to be unlike fish, but scientific classification clarified their true place among mammals. Naturalists such as Carl Linnaeus formalized whale classification in the 18th century, while comparative anatomy showed that whales breathe air through lungs and nurse their calves with milk. These traits place whales with mammals rather than fish, despite their fully aquatic lifestyle. Modern genetics has confirmed that whales are related to even-toed hoofed mammals.
Key Facts
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