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Biosphere Spanien

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Lammergeyers or quebrantahuesos (bone breakers) as they are known in Spanish are the largest bird of prey in Eurasia, and Europe’s rarest vulture, around 70% of which live in the Aragonese Pyrenees, where the expedition takes place. They feed on marrow which they get by dropping bones repeatedly onto rocks, as their Spanish name aptly suggests. Their old name in English of ossifrage also refers to this habit. They are also known in English as bearded vultures. This is in reference to the ochre ruff of quills they sport around their necks. They are not born this way, but acquire the colour by actively seeking out iron-rich muds and rubbing their feathers in them. The theory goes that in a stand-off, the redder the feather, the tougher the lammergeyer.

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