| 11. | They could still produce normal sperm and copulate with females.
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| 12. | The males chase the females almost immediately in an attempt to copulate,
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| 13. | The hallways of apartment houses are littered with sewage and copulating couples.
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| 14. | This was unusual because the keepers knew they copulated regularly.
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| 15. | Many animals rear up on their hind legs whilst fighting or copulating.
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| 16. | Each female copulates with many males, and vice versa.
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| 17. | Some sea mammals copulate in a belly-to-belly position.
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| 18. | Bats have been observed copulating in caves until early October.
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| 19. | These were ordered to copulate with all the girls available.
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| 20. | The heads used are swapped each time the mammal copulates.
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