protective coloring

It standardized dyes and made studies of protective coloring.

The bird, evidently trusting to its protective coloring, sat on the limb without moving a muscle.

Like the animals, in their protective coloring, he becomes an undistinguishable part of his surroundings.

The journalist and his papers exist by reason of their "protective coloring."

They thus escape detection, for the protective coloring of these birds and of their eggs is marvellous.