My biological clock is disrupted, and I've been having sleepless nights.

Invasive species can have a major impact on the natural environment.

A shrew is a small mammal that mainly eats insects.

A light shower occurred in the park, and the children were delighted.

The Japanese grass vole is a small mammal native to Japan.

The harbour porpoise is a small dolphin that lives in the cold sea areas of the Northern Hemisphere.

The lemming is a characteristic small mammal of the Arctic region.

We started killing rodents in the house.

We set traps to kill the mice in the house.

The rat stole my food.