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.
A skin incision is made through the abdomen and a needle introduced into the stomach. A snare is passed down the endoscope in order to capture a wire or suture that has been placed through the needle. A feeding tube, through which food will be sent directly into the stomach, is advanced over the wire into the stomach.