The bearded vulture feasts mainly on bones, which it digests with the strong acid in its stomach. They acquire a reddish tinge either from the blood of a carcass or reddish dirt, which they're instinctually attracted to rubbing into their feathers.
However these carrion feeders have been known to be good human companions in captivity.
Thomas Littleton Powys, the 4th Baron Lilford (1833-1896) raised a couple of bearded vultures
at his home estate and found them to be "tame and perfectly harmless; indeed, with the exception of a few playful attacks on trousers, gaiters, petticoats and boots, I never heard of any malice on their part towards any living creature."
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