Have you ever seen flamingos in the wild or in captivity

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You will notice their beautiful pink feathers, but some seem more pink than others.
Not only do their colours range from very pink to a dull sort of pink but when a flamingo is born you see its original true colour

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This being greyish (And Kind of weird looking)

So how do flamingos then turn pink at a later stage ?

Its all about what they eat

There is something called canthaxanthin which is a natural pink dye which is found in high doses in their food - brine shrimp and blue-green algae.

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TL : DR version - Flamingos are actually born grey , they get their coloration from their diet of brine shrimp and blue-green algae and only turn pink later on.

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Source :
http://www.sciencefocus.com/qa/why-are-flamingos-pink
http://wonderopolis.org/wonder/pink-flamingos