| 1 | The cuckoo lays its eggs in other birds' nests. | |
| 2 | Many sea fishes spawn in rivers. | |
| 3 | A main objective is to protect spawning and young fish. | |
| 4 | They provide spawning grounds and nutrients for fish and shellfish. | |
| 5 | Even then, they only lay eggs about every five years. |
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