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 likes to take a walk in the park at dusk.

He is spending a lot of time on experimental research.

He said, 'Each person has one life, like a pike or a shrimp,' and decided to live his life with care.

Old English is a language that was spoken in England from the 5th to the 12th century.

He vowed to live through this world and the next with the spirit of once-in-a-lifetime encounter.