| 1. | Plumage variation between the sexes is closely related to breeding system.
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| 2. | This breeding system may enable successful reproduction in harsh environments.
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| 3. | The existence of an amazingly complex cooperative breeding system was discovered among Seychelles white-eyes.
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| 4. | The cuckoos are an extremely diverse group of birds with regards to breeding systems.
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| 5. | Single-male breeding systems-or extra pair copulation ( EPC ) societies.
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| 6. | Frigatebirds are known for their unusual displays and breeding system.
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| 7. | Critics set the games apart by noting the in-depth breeding system seen in this game.
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| 8. | After 1900, black bulls were removed from the breeding system, and the black colour vanished.
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| 9. | Acorn woodpeckers provide substantial information on breeding systems because they practice monogamy, polyandry, and polygyny.
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| 10. | Some studies have suggested polygamy, while others have suggested monogamy is the most important breeding system.
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