Birds sing at a higher pitch in urban noise: great tits hit the high notes to ensure that their mating calls are heard above the city's din
Article Abstract:
Investigation in an urban population of great tits in the Dutch city of Leiden shows that the spectral composition of ambient noise was generally characterized by loud, low frequency sounds. It is noticed that urban great tits at noisy locations sing with a higher minimum frequency.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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Why do birds engage in extra-pair copulation?
Article Abstract:
Extra-pair fertilizations are more likely when social mates are genetically closely related in case of birds. However, there is still no convincing evidence that extra pair copulation in birds is influenced by the relatedness between partners.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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Delta-wing function of webbed feet gives hydrodynamic lift for swimming propulsion in birds
Article Abstract:
Results indicate that in foot-propelled swimming birds, delta shape of their webbed feet can propel them continuously through two successive modes, from the drag at the beginning of the stroke through hydrodynamic lift later in the stroke.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2003
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