𝔖 Bobbio Scriptorium
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Breeding Habits of the Swift


Book ID
109567368
Publisher
Nature Publishing Group
Year
1951
Tongue
English
Weight
250 KB
Volume
167
Category
Article
ISSN
0028-0836

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Causes and consequences of non-breeding in willow tits were studied in northern Finland during 1986-1992. The breeding status was sex and age biased; males and yearling birds were in excess among the non-reproducers. Due to sex bias in the population it appeared detrimental for males to lose a mate,