Hollow Melanosomes in Platypuses: A Unique Discovery
Hollow melanosomes were previously thought unique to birds.
Platypus melanosomes do not create iridescence, appearing dark brown.
Study examined 12 platypus hair samples and 126 mammal species.
Hollow melanosomes absent in echidnas and other mammals.
Researchers speculate hollow structures may provide insulation.
Evolutionary ecologist Tim Caro says the feature is unrelated to color.
Further research is needed to understand the evolution of these melanosomes.