Nature

3. a small animal like a mouse with wings that flies at night
4. a large area of water surrounded by land and not connected to the sea except by rivers or streams
8. damage caused to air by harmful substances or waste
9. an area of land covered with a thick growth of trees
12. small flying insects that bite people and animals and suck their blood
15. a sea creature with a soft, oval, almost transparent body
17. catching too many fish in an area of the sea, so that there are not many fish left there
19. an animal that produces eggs and uses the heat of the sun to keep its blood warm
20. animals of which the female feeds her young on milk from her own body. Most mammals give birth to live young, not eggs

1. the reduction in the amount of space where a particular species, or group of species can survive and reproduce
2. an area of grass, trees, or other vegetation set apart for recreational or aesthetic purposes in an otherwise urban environment.
5. an area of land that is protected in order to keep safe the animals and plants that live there, often because they are rare
6. chasing and killing an animal or bird for food, sport, or profit
7. a large area of water surrounded by land and not connected to the sea except by rivers or streams
10. a small, brown animal, similar to a frog, that has big eyes and long back legs for swimming and jumping
11. a large reptile with a hard skin that lives in and near rivers and lakes
13. a small creature with eight thin legs that catches insects in a web
14. a small animal with a long, narrow, soft body without arms, legs, or bones
16. a very large animal with short legs and thick, dark grey skin that lives near water in Africa
18. very small animals with six legs, a body divided into three parts and usually two pairs of wings, or, more generally, any similar very small animal