Did we lose our ability to see in infrared light ? Or we never had it to begin with ? Does DNA mutations has to do something with it because some have blue eyes instead of brown and they say this is because DNA mutation happened only once in Europe somewhere.

Question

Those animals who hunt in night need vision in infrared light. So, were they first night hunters and then developed vision in infrared (due to mutation in DNA ?) and stayed with them forever according to Darwin’s theory (survival of the fittest) or they realized they had infrared vision and so why not hunt in night only ?

In: Biology

Answer 1

Animal that hunt during the night just have a high sensibility to light and sometime can see just a little bit further into infrared, but it’s not infrared vision.

Some animal can detect infrared, but those are not through the eyes. Usually those are little sensory organ that detect infrared, but they are not as complex as eyes. It just sense the direction from with the infrared come from, a bit like the first proto eye were able to detect the direction of light.