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Some ocean animals have a clever form of camouflage. They're transparent, but being

see-through is far less common on land. And there's a few reasons why that might be.

Jim Barnett is a post-doctoral research fellow at McMaster University in Ontario, Canada.

Differences between air and water as a surrounding medium means that light interacts differently

with a transparent organism's body tissues.

In the ocean, light is always coming from above and the background is less variable.

But in jungle canopies, light is coming from all over the place and the background is far more

variable. Enter a little critter called the glass frog. It's not actually transparent, it's

translucent. That means it's skin in some not actually see its

skin in some places is thin enough that you can actually see its

internal organs hard at work.

Most of the time when you see photographs of these frogs they're taken under quite controlled conditions with either strong lighting or like a powerful flash or they're photographed from underneath on a piece of glass and it's really their bellies which are transparent.

And these frogs are pretty small and thin and quite delicate.

So if you have a powerful flash on your camera, you can sort of just blast light through them and they will look

pretty transparent.

Barnett says the frog's translucent skin is actually a novel camouflage strategy that

no one's ever really studied until now.

What we think is happening is that light is traveling through the frog,

interacting with the pigmentation, but a lot of it does pass through the frog and

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