❓ why
Why do whales and dolphins live in water if they are mammals?
MammalsEvolution
Quick Answer
Whales and dolphins live in water because their ancestors returned to the sea after evolving on land. They still breathe air with lungs, but body shape and physiology changed to suit aquatic life.
The Full Story
Cetaceans, the group that includes whales and dolphins, evolved from land-dwelling mammals about 50 million years ago. Over time, their limbs transformed into flippers, their tails developed flukes, and their bodies became streamlined for swimming. They remain mammals because they breathe air, are warm-blooded, and nurse their young with milk. Fossils such as Pakicetus and Ambulocetus help document this transition from land to sea.
Key Facts
1.Whale ancestors lived on land about 50 million years ago
2.Cetaceans breathe air with lungs
3.Fossils like Ambulocetus show the land-to-sea transition
YouTube Angle
Suggested video title for this topic:
"The amazing story of how mammals returned to the ocean"