If it’s weird on the outside, there’s a chance it’s weird on the inside. For example: the platypus. Evolution made sure this critter is the exception, and it continues to fascinate scientists!
A recent study on the strange creature shed light on how it's, well, even weirder than we thought. Scientists observed their fur has microscopic structures called melanosomes, the stuff inside cells responsible for the pigment called melanin. These researchers cross-referenced this by looking at over 100 mammals, all of which had solid melanosomes. But the duckbill platypus for some reason has hollow, spherical melanosomes, which up until now were known only to exist in birds!
For many birds, this type of melanosome allows for bright colors or iridescent features to reflect light with their feathers. However, the platypus isn’t exactly a bright rainbow-colored flashy creature; it’s mainly covered in varying shades of dark brown.
So, what gives? Why does this animal have this biological feature? No one knows quite yet, but a guess is that it’s a leftover trait from an ancient ancestor. This is a great reminder that evolution is not always a nice, neat linear line. Over long periods of time traits can change functions, survive after their purpose disappears, or just leave scientists scratching their heads.
This specific discovery challenges some of the current assumptions about mammalian pigmentation. And the platypus itself is a great reminder of why biodiversity on Earth matters. After all, the weirdest animal in the room might also be the one that helps rewrite textbooks!
