birding-aus

Re: Factors affecting clutch size

To: <>
Subject: Re: Factors affecting clutch size
From: Peter Jacoby <>
Date: Sat, 13 Dec 2008 10:37:09 +0900

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 My understanding is that the larger clutch sizes of hole-nesting
birds is associated with  a longer period betwen hatching and the
young leaving the nest. For example the young of most species of
honeyeater have fledged within 15 days whereas treecreepers remain in
the nest for up to 25 days.

        Presumably the lower risk of predation for hole-nesters means that
the young can afford to grow more slowly, consuming less food which
enables the parents to share out a limited food resource between more
little beaks.

        Peter Jacoby
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