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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

Brittle stars are close relatives of starfish with a much more delicate appearance.

As if you imagine a starfish with really skinny, spiny arms, kind of made up of lots of little articulated plates.

That's kind of what a brittle star looks like.

A cross between a millipede and a starfish, I guess.

Lauren Sumner Rooney is a visual ecologist at Oxford University,

and one of the brittle star species she studies, Ophiocoma-Wentie,

also has color-changing superpowers.

If you catch one of these animals during the day,

they're a really beautiful kind of reddish-brown, dark-brown color.

If you actually go out again at night and try and collect the same animal,

there's very pale beige with kind of dark stripes.

The reason for that color shift, though, was murky, perhaps for UV protection or camouflage.

But now Sumner Rooney's team has come up with a possible answer.

That red coloration might help the brittle stars sort of see, even though they have no eyes. In bright daylight, their redness filters the light

reaching photoreceptors along their arms. Brittle stars like hiding in shady parts of the reef,

so the researchers place the brittle stars inside an environment with black and white patterned walls aimed at testing whether the creatures were simply light sensitive, which isn't the same

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