The platypus is one of the planet’s strangest creatures on several counts. Though mammals, these Australian natives lay eggs and sport venomous spines on their rear legs. They also have beaver-like tails and duck-like bills, the latter of which they use to sense prey while hunting at night with their eyes closed.
Platypuses are biofluorescent, meaning their fur glows a bluish-green hue under ultraviolet (UV) light. This photograph, part of a composite image used in a study, uses a yellow filter that reveals a more “true” color of the fur’s fluorescence.
This image shows what platypuses look like when illuminated with ultraviolet (UV) light. Researcher Jonathan Martin explains that UV light “saturates everything in purple light so the camera has a hard time recording what the