God only knows what he is thinking.

The vaquita is an endangered species and one of the rarest marine mammals in the world.

The Amazon River dolphin is known for its beautiful pink body.

The Indian humpback dolphin lives in the Indian Ocean and the Western Pacific.

The Yangtze River dolphin, or baiji, is an endangered species that needs protection.

She described the pain of a broken heart as tears.

I don't know a thing about him.

He emphasized his belief by saying, 'I believe in order to understand.'

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

He is the type of person who understands ten from hearing one.