Color vision varies significantly across species due to different types and numbers of photoreceptors. Humans are trichromats, meaning we have three types of cone cells that detect red, green, and blue wavelengths. However, many animals perceive color differently:
- Birds and some insects 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 see primarily blues and yellows, with limited red perception
- Butterflies have up to 15 different photoreceptors, giving them extraordinary color vision
These differences evolved based on each species’ survival needs and environmental adaptations.