Why Aren’t Mammals Green? A Colorful Evolutionary Puzzle
Have you ever looked at a frog, a lizard, or a parrot and noticed how vibrantly green they are? It’s a common sight in the animal kingdom. Now, think about mammals. Foxes, bears, mice, even us humans – we’re generally shades of brown, black, white, or gray. So, why the big color difference? Why are … Read more