Head to head
Bottlenose Dolphin vs Great White Shark
Dolphins and sharks look superficially alike — fast, grey, fin on top — and they share the same seas, but they are only very distantly related. One is an air-breathing mammal, the other a fish, and the differences run all the way down.
| Bottlenose Dolphin | Great White Shark | |
|---|---|---|
| Animal class | Mammal | Fish (cartilaginous) |
| Skeleton | Bone | Cartilage |
| Breathing | Lungs — must surface through a blowhole | Gills — extracts oxygen from water |
| Body temperature | Warm-blooded | Regional endotherm — keeps muscles warm |
| Tail movement | Up and down | Side to side |
| Reproduction | Live birth, one calf, nurses for years | Eggs hatch inside the mother; 2–10 pups, no care |
| Social life | Highly social pods; names, cooperation | Mostly solitary |
| Key sense | Echolocation (biological sonar) | Electroreception; smell |
| Lifespan | 40–60 years | Up to 70 years |
Dolphin vs Shark: common questions
Is a dolphin a fish or a mammal?
A dolphin is a mammal. It breathes air with lungs, is warm-blooded, gives birth to live young, and nurses them with milk. Sharks are fish — they have gills and a skeleton made of cartilage.
Can a dolphin beat a shark?
A single dolphin cannot beat a large great white, but a pod can. Dolphins protect their young by charging sharks and ramming them in the gills and belly with their hard snouts, and the impacts can injure or drive off the shark.
Are sharks afraid of dolphins?
Sharks are wary of groups of dolphins, which can gang up and injure them, and they avoid killer whales entirely — orcas (the largest dolphins) hunt great whites and eat their livers. Lone dolphins get no such respect.