One thing we all know about cassowaries is that they are very territorial, and can be dangerous to humans, which is why it is hard for scientists to study them. They have casques made of keratin on their heads, which resemble helmets. What they are for is still a mystery. They could be for fighting, showing off for the opposite sex, or maybe even to amplify sound. And lately we've found out that these casques are fluorescent as well! In a paper published in Nature, scientists reveal that cassowary casques will glow in different colors and patterns that vary between the three existing species. They even vary somewhat between individual birds. Not only that, but the patterns displayed by biofluorescence are different from the pattern shown by their ultraviolet reflectivity. Therefore, under the right light, every cassowary has a distinct fluorescent color pattern that could be as individual as fingerprints.
We still don't know how well cassowaries can see each other's fluorescent patterns, and how they use them. But we may be able to use the patterns to tag the birds for study. Read an explanation of this research at Refractor. -via Damn Interesting
(Image credit: Todd L. Green)
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