Wallabies have been officially classified as a dichromat. This means that they have two of the cones that allow them to see color, not all three. This effectively limits their color vision. Scientists estimate that they see about as much color as a dog or as a color-blind human. In a recent study, conducted in 2014, it was concluded that the wallaby studied - the Tammar wallaby - could only see a range of wave lights between 440 nm and 500 nm. That’s a small chunk of colors to see.
The most interesting thing about this is that wallabies are marsupials, like possums and kangaroos. Most marsupials have been classified as having trichromatic vision, or a full color spectrum. However, when one finds a dichromatic marsupial, there’s absolutely no evidence of that third cone in their genes. Science at its finest.
