A house cat's bizarre antics may be more than just feline folly. The kitty may be seeing things that human eyes can't.
Unlike humans, many animals see in ultraviolet, and a study now suggests that cats, dogs and other mammals can, too. Knowing these animals see things invisible to humans could shed some light on the animals' behavior, the researchers say.
"Nobody ever thought these animals could see in ultraviolet, but in fact, they do," said study leader Ron Douglas, a biologist at City University London, in England.
Light is made up of a spectrum of colors. Visible light (that humans can see) spans from red to violet, and beyond the visible lie ultraviolet wavelengths. Many animals are known to have UV-vision, including insects (such as bees), birds, fish, some amphibians and reptiles, and a handful of mammals (such as some mice, rats, moles, marsupials and bats).
(and what about Infrared?)