Tarsiers are tiny primates with enormous, bulging eyes, best suited for the creatures' role in nature which appears to involve slinking up and down branches at night with oversize, webbed hands while looking as bewildered as can be. Part Gollum, part the snake character in Disney's Robin Hood, the tiny Philippine tarsier is said to have the largest eyes of any mammal relative to its size. Those eyes are rooted in their sockets and remain shiftless. Creepily, the creature can swivel its head a full 180 degrees; it can also curl up, flatten or unfurl its membranous ears at will. Tarsiers, which hide during the day in the shallows of trees or other tropical vegetation, prey on insects and rarely eat plants. They are said to make lousy pets.