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Ian Newton, Auteur ; Alistair Dawson, AuteurBirds use change in daylength during the year to time events during their annual cycles. Individual Eurasian siskins Carduelis spinus can breed and winter in widely separated areas in different years. Birds at different latitudes will experience[...]
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George R. Young, Auteur ; Alistair Dawson, Auteur ; Ian Newton, Auteur ; Lee Walker, AuteurDifferences between species in breeding seasons are thought to be mediated through differences in their reproductive physiology. Little is known about how the timing and duration of gonadal maturation varies between raptor species, how the timin[...]
