Here's why:
* Dolphins are mammals. They breathe air, give birth to live young, and nurse their offspring. They live in water, but are not fish.
* Amphibians are vertebrates that live both on land and in water. They have smooth, moist skin, and most lay eggs in water. Examples include frogs, toads, and salamanders.
Key Differences:
| Feature | Dolphins | Amphibians |
|---|---|---|
| Class | Mammal | Amphibian |
| Breathing | Lungs (breathe air) | Gills in larval stage, lungs in adult stage |
| Reproduction | Give birth to live young | Lay eggs |
| Skin | Smooth, often with a layer of blubber | Smooth, moist |
| Habitat | Exclusively aquatic | Primarily aquatic, but some live on land |
So, while both dolphins and amphibians live in water, they are vastly different in their biological makeup and characteristics.