"The animals are actually developing color on the skin and they're doing it without pigments, and they potentially have the chance to be picking a certain color, " Wardill said.

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Medical teams planned for the births for months, even designating a special "Code 5" designation, handing out pagers to staff and developing a color-coded system to match each baby with his or her needed supplies.

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The system is modeled after military base security protocols in which a color code signifies the level of precaution and perceived threat, according to two officials involved in developing it.

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