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D850 with Nikkon 400mm f2.8 ISO 140, 1/1600 sec. (tripod) 28/05/19 --- The rarest and largest vultures in Europe with a wingspan of 9 feet. The fiery orange to gold colouration comes from their instinctive habit of rubbing soil stained with iron oxide into their feathers. The darker Vulture on the left is an immature bird.
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Standing up to 4 feet tall, it is a scavenger, with 80% of its diet coming from bone and bone marrow, digested within 24 hours due to a stomach acid of pH 1. The adult in this photo picked up the bone beside its left foot and swallowed it whole, just like a "sword swallower" !
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Larger bones, like the Goat's leg in this pic will be dropped onto a favourite rocky spot, from a height of circa 100 metres to shatter it and release the bone marrow. I noticed that each bird picked up the bone in its talons, ran forward to gain take off speed (much like a Swan or Albatross) and once air born transferred the bone to its beak by bringing its leg forward to the mouth rather than by bending its head down and backwards to take the bone off the foot --- interesting !