Nests_and_eggs_2010

Nests_and_eggs_2010 - Nests and Eggs Nests are more than...

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Nests and Eggs Nests are more than egg-holders Protection from predators Protection from thermal environment
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How to protect from predators Concealment
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How to protect from predators Confusion
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How to protect from predators Make nest Inaccessible
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More ways to be inaccessible How are they safe? Cliffs
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Nest in association with aggressive species
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Construct nest with impenetrable walls Costs of Cavities : 1. Adult can be trapped by predator 2. Nest holes are in short supply (competition) Benefits of Cavities : 1. Less visible 2. Protection from elements
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Other types of cavities
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Protection from the thermal environment It’s obvious birds do this: Verdin example
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Protection from cool temperatures Generation of heat Example: Mallee Fowl (Austraila). Male controls temperature of eggs by kicking sand on and off of the egg chamber
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Protection from cool temperatures Insulation Tree Swallow example (David Winkler) Young in nests with more feathers fledge earlier Experiment (How would you test?)
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Nests_and_eggs_2010 - Nests and Eggs Nests are more than...

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