Can a deer visually detect a tiger in the background of green bush and trees?

No, a deer cannot see an orange tiger.

Deers, as well as most of animals tigers prey on, are dichromate, which means that they can only pick up blue and green light and are effectively colourblind to the colour red or orange.

Tigers’ orange colouration looks green to deers. It allows tigers to blend perfectly into the green background.

But why tigers haven’t simply become green during their evolution?

Tigers could not grow green coats because due to their biochemistry mammals are not able to produce green fur.

A question that remains open for researchers is why deers never evolved trichromatic vision, as this might help them to stop getting eaten.

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