The northern elephant seal is a large marine mammal that mainly lives in the northern hemisphere.

The bearded seal is a marine mammal often seen in the Arctic.

The ringed seal is the most commonly seen seal in the Arctic Circle.

The Mediterranean monk seal is listed as an endangered species.

The Hawaiian monk seal is an endangered species.

Echinoderms are a type of marine life, many of which have star-shaped bodies.

The characteristic of annelids is that their bodies are divided into ring-shaped segments.

A tardigrade can survive in extreme environments.

Invertebrates are a type of creature without a skeleton.

He is an expert in ethology, and his research is highly regarded worldwide.