It is reported that North Korea has conducted another underground nuclear test.

He is an expert in experimental psychology.

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.

He is studying about ancient animal worship.

Cnidarians are a type of marine life, including jellyfish and corals.

We went to the petting zoo on the weekend.