Mammals have worse color vision than birds, reptiles, fish, even our proto-mammalian ancestors. Why did we DEvolve tetrachromatic color vision?

This is the 2nd video in a 4-part series on the evolution of color vision. Subscribe to this channel to make sure you see the other parts!

Opsin Refresher:
Opsins are the molecules (proteins) in the eyes that essentially catch light. You have multiple opsins that are sensitive to different wavelengths of light. These opsins are contained within photoreceptor cells called Cones. Typical humans have red, green and blue opsins, and therefore red, green and blue cones. However, many colorblind individuals only have two different cone types. Having two opsin classes is required for color vision, and having more (3 or 4) opsins essentially leads to more complex color vision.

Part 1:
   • What was the FIRST ANIMAL to see COLOR?  
Show Notes and Transcript:
https://chromaphobe.com/nocturnal-bot...
Glossary, including most of the technical terms in this video:
http://chromaphobe.com/words/

00:00 Intro
01:04 Opsin Stability
02:42 Evolutionary Pressure
03:54 Burrowing
04:10 Cave Dwelling
04:30 Deep Sea
05:33 Dim Sea
06:50 Nocturnal
08:59 Negative Pressure
11:29 Conclusion