Mammals in general have color vision of a limited type, and usually have red-green color blindness, with only two types of cones. Humans, some primates, and some marsupials see an extended range of colors, but only by comparison with other mammals.
snare (plural snares) 1  A trap made from a loop of wire, string, or leather. ( 2 rare) A mental or psychological trap; usually in the phrase a snare and a delusion. Shakespeare If thou retire, the Dauphin, well appointed, / Stands with the snares of war to tangle thee.
trap, snare, entrap, ensnare imply seizing by some device that holds the one caught at the mercy of the captor. trap and snare apply more commonly to physical seizing. trap animals; snared butterflies with a net; entrap and ensnare more often are figurative. entrapped the witness with a trick question; a sting operation that ensnared burglars