A Bird That Produces "Pink" Milk
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The world has more than 10,000 species of birds, but only three of them create "
milk"
: doves, flamingos and emperor
penguins
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These birds are among the few that feed their young with
crop milk
, which is not to be confused with
mammalian milk
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Among these birds,
flamingos
have the most strange form of milk that looks like cottage cheese and gives them their signature
pink colour
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Flamingo
chicks hatch with white-gray but it's because of the high concentration of beta
carotene-rich
food that their feathers turn
pink
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The birds secrete it from the lining of their crops - a pouch-like part of their
digestive system
typically used for food storage
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This crop of milk produced by
flamingos
is highly
nutritious
and parents serve this to their babies
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Once eaten, enzymes in the
digestive system
breaks down the beta carotene and the
pink pigments
are absorbed by the fat in its liver
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These fats are then deposited in the
flamingo's feathers
and skin as it grows and the bird gradually turns pink
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The liquid is compositionally similar to
mammalian milk
and serves a similar purpose, hence the name
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