| spy | to see without being seen |
| peering | looking in a searching way |
| blind | unable to see |
| peculiar | unique |
| identified | named or discovered |
| creatures | living beings |
| exist | to live |
| extinction | when no member of a species survives |
| populations | certain living things in a certain place |
| underground | below the earth’s surface |
| tame | gentle and meek |
| energy | power to do work |
| affect | have an influence on |