Head to head
Ringed Seal vs Crabeater Seal
The ringed seal and crabeater seal occupy opposite poles of the planet, but both hold outsized ecological importance for their respective ecosystems despite rarely making headlines compared with more famous marine mammals.
| Ringed Seal | Crabeater Seal | |
|---|---|---|
| Scientific name | Pusa hispida | Lobodon carcinophaga |
| Hemisphere | Arctic (Northern Hemisphere) | Antarctic (Southern Hemisphere) |
| Primary diet | Small fish and crustaceans | Almost entirely krill |
| Ecological role | Primary prey of the polar bear | Likely most numerous large wild mammal after humans |
| Key adaptation | Claws for carving ice breathing holes | Lobed teeth for filtering krill |
| Conservation status | Least Concern | Least Concern |
| Population trend | Decreasing | Stable |
| Diet | Carnivore | Carnivore |
Ringed Seal vs Crabeater Seal: common questions
Which seal is more numerous, the ringed seal or the crabeater seal?
The crabeater seal is far more numerous, with a population estimated in the tens of millions that likely makes it the most abundant large wild mammal on Earth after humans, while the ringed seal, though the most widespread Arctic seal species, has a considerably smaller overall population.
Why is the ringed seal so important to polar bears?
The ringed seal serves as the primary food source for polar bears across most of the Arctic, meaning polar bear hunting success and survival depend directly on ringed seal abundance, a relationship the crabeater seal does not share since its main Antarctic predators are leopard seals and orcas rather than a land-based bear.
Does the crabeater seal actually eat crabs?
No, despite its common name, the crabeater seal feeds almost entirely on krill filtered through uniquely lobed, interlocking teeth, a naming mismatch that has persisted despite not accurately reflecting the species' actual diet, quite different from the ringed seal's diet of small fish and crustaceans.