He was born as an illegitimate child and experienced many difficulties.

My grandfather used to till his privately-owned rice field.

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

Mammals can maintain a constant body temperature.

Primates are a group of mammals that include humans.

Crustaceans are a type of marine life, including crabs and shrimps.

Insects are an important part of the natural world.

The beauty of butterflies is breathtaking.

It's fun to see colorful butterflies in the park.