Summary
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1.
Interspecies pairings between captiveCarduelis carduelis, Clitoris ckloris and domestic canaries result in a roughly similar output of eggs per pair, and probably in a comparable number of offspring, as pure species pairs. The interspecies differences in plumage, voice and display patterns thus seem not to be of crucial importance when pairing is forced. It is suggested that in nature these differences are primarily significant at the time of pair formation.
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2.
The plumage characters of goldfinch × greenfinch hybrids are examined. Most characters are variable and more or less intermediate between the parent species, but in some cases the condition found in one parent is dominant.
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Hinde, R.A. Breeding success in cardueline interspecies pairs, and an examination of the hybrids’ plumage. J Genet 54, 304–310 (1956). https://doi.org/10.1007/BF02982785
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DOI: https://doi.org/10.1007/BF02982785