Male squirrel monkeys don’t see color well; they have a kind of red-green color blindness. Dalton's eyes really only see medium and short wavelengths of light—blues and greens, and their ...

Since human genes were used and the monkeys' eyes and brains are similar to ours, at least in terms of color vision, the researchers hope the same procedure could work in humans.

They have broad, dark-colored faces with wide, expressive eyes. They average between 13 and 14 pounds. Diet. Beyond leaves, red leaf monkeys also consume large amounts of seeds and flowers.

They got interested in the genetics of eye disease during their post-doctoral studies. In 1989, Jay Neitz's research at Santa Barbara confirmed that dogs are color-blind.

Monkeys and their human cousins don't necessarily see the world the same way, ... green and red. 2:22. ... Smith devised his experiment to give the tamarins an eye-test.