Something that is poisonous can kill someone or make them very sick. Poison dart frogs are poisonous.
The way a person is feeling. For example, a person can be in a happy mood.
A kind of lizard. It can change color when its mood changes.
A thick forest with rainy weather. A rainforest is a habitat where many kinds of plants and animals live.
If something blends into its background, it means it looks like the things around it. Something that blends in can be hard to see. These Arctic hares blend into the snow.