1. Ants! They are hard workers!

2. To enter without being asked.
invade
To enter without being asked.

3. Something that hides something or keeps it safe.
covering
Something that hides something or keeps it safe.

4. A path built under the ground
tunnels
A path built under the ground

5. A person or thing that wants to hurt another.
enemies
A person or thing that wants to hurt another.

6. A tiny, hard piece of something.
grain
A tiny, hard piece of something.

7. disappeared
To no longer exist.

8. insects
A six-legged bug.

9. A group of plants or animals of the same kind that live together.
colonies
A group of plants or animals of the same kind
that live together.

10. A case that protects an insect while it changes into an adult.
cocoon
A case that protects an insect while it changes into an adult.

11. mandibles
The jaw of an ant