Humans are trichromats, meaning we have three types of cone cells in our retinas that detect red, green, and blue wavelengths. However, color vision varies significantly across species:
- Birds and some reptiles are tetrachromats, having four types of cone cells, allowing them to see ultraviolet light
- Most mammals are dichromats, having only two types of cone cells
- Dogs and cats see primarily blues and yellows, with limited red perception
- Butterflies have the most complex color vision, with up to 15 different photoreceptors
This variation in color perception helps different species adapt to their environments and specific needs, such as finding food or identifying mates.