- Science researchers first discovered that a platypus glows when you shine UV light
- This prompted Australian researchers to try a UV light out on other creatures
- They found wombats, bilbies, possums and some bats also shine under UV light
- Scientists don’t yet know why mostly nocturnal creatures glow under UV light but suspect it could be to help them spot fellow members of the same species
Australian mammals and marsupials including wombats and platypus ‘glow in the dark’ under ultraviolet light, according to a team of scientists.
Western Australian Museum researchers borrowed a UV light to shine on different creatures in response to an earlier US study that found platypus are biofluorescent.
Not only were they able to confirm the findings that platypus glow in the dark, but accidentally discovered many other marsupials and mammals also glow.
Researchers don’t yet know why these creatures – including wombats and bilby – glow in the dark, but believe it could be to help them spot fellow members of their own species as the bulk of those glowing in the dark were nocturnal.
In October US scientists from Northland College discovered – accidentally – that if you shine a UV light on a platypus it will glow green in the dark.
This is a form of biofluorescence – something that has long been known about in plans, insects and sea creatures – but until now had not been seen in mammals.
Inspired by the US discovery, Kenny Travouillon, a palaeontologist from Western Australia Museum, found a UV light and used it on specimens in the museum.
‘We borrowed it and turned off the lights in the collection and looked around for what was glowing and not glowing,’ Dr Travouillon told ABC News.
They started by checking the platypus to verify the findings of the US study and they found they ‘were all glowing, which confirmed the research.’
After confirming the US research Travouillon looked to marsupial moles and wombats – finding they also started to glow under UV light.
‘We did on the carnivorous marsupials and they did not glow at all,’ he told ABC, adding this could be because if prey can see UV light the predators couldn’t hide.
Travouillon, who is curator of mammalogy at the museum, has tried the UV light on two dozen mammal species – not an extensive search, but an overview.
He said about a third of them were found to glow under UV light including the platypus, echidna, bandicoots, bilbies, possums and some bats.
‘After platypus was shown to glow under UV light, couldn’t resist trying bilbies… their ears and tails shine bright like a diamond,’ he wrote on Twitter.
Bioflourescence is triggered when a living creature is able to absorb enough high energy radiation – such as UV light – that it can emit it at a lower frequency.
‘There are compounds in lots of different animal parts that do seem to fluoresce, so it’s not surprising to find there may be other chemical compounds in other things like fur that fluoresce,’ wildlife forensic scientist Greta Frankham told ScienceAlert.
Many of the creatures found to glow under UV light are also nocturnal, the team behind the latest discovery explained.
This included bilbies, an endangered desert dwelling species that likes eating scorpions – another animal that glows under UV light.
Other nocturnal creatures found to glow in the dark included the wombat and the bandicoot – but for humans to see the glow we need an intense UV light source.
This prompted Travouillon to speculate that the creatures can see much more than we are able to see.
However, Michael Bok, an expert from Lund University in the evolution of vision, said it was unlikely there was any visual signal responsible for animals evolving this trait.
‘Be careful about applying ecological or visual relevance to this. Many biological materials fluoresce, but the lighting conditions where it is visible to anything are incredibly unnatural. It is extremely implausible that this is a visual signal,’ he said.
Bok shared a mock research paper with the words ‘insert animal’ to illustrate that so many creatures have been shown to glow under UV light that more work is needed to understand why.
Doctoral student from the University of Exeter, George Hancock joked: ‘Honestly you could parade around a zoo with a black light at this point and just generate papers. Why do they glow, we don’t know? Cause apparently that’s enough.’
The original US paper on biofluorescence in the platypus has been published in the journal Mammalia.
News Source: Daily Mail