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- The entire process of courtship and reproduction is complex, with external stimuli and Corvidae, titmice).ornithology.com/lectures/Reproduction.html
- Reproduction header Male birds have two testes that produce sperm, and most female birds usuallywww.nhm.org/birds/guide/pg016.html
- Avian Reproduction - Triggers and Hormonal Changeswww.birdsnways.com/wisdom/ww34eiv.htm
- The Incredible Female Bird - Reproductive System, Avian Reproduction - Triggers and Hormonal Changes and The Male Birdwww.birdsnways.com/wisdom/ww35eiv.htm