The animal kingdom is known for its diversity and complexity.

I avoid eating animal products.

He is deeply involved in the animal liberation movement.

Protozoans are single-celled organisms.

As the name suggests, chordates are a group of animals that have a notochord.

He is learning Ancient Greek language.

He always does perfect work, but he made a mistake today. Well, even monkeys fall from trees.

Seeing his failure, we laughed like a monkey's butt.

The Monkey-eating Eagle, also known as the Philippine Eagle, is the national bird of the Philippines and is listed as an endangered species.

Capuchin monkeys are considered to be very intelligent.