IF you can spot the hidden second animal in this picture then you're in the top 1percent – and there are clues to help.

The brain-busting optical illusion has created quite the stir online.

TikToker HecticNick uploaded the visual gimmick, which shows a dog standing next to a tree with no leaves.

"This picture is now what you it is!," he says.

"Look like there's just a dog! There's actually a hidden cat."

Users were left absolutely baffled, with some going as far as to suggest the dog was actually a cat.


What you see in this optical illusion could prove you have a razor-sharp eye

Springwatch fan spots VERY spooky optical illusion in tree behind bird

"THE DOG ISS THE CAT," one user posted.

"So who will accept cats are better like Mother Nature is making a cat from a tree," hinted another.

"In the tree," wrote a third.

Look a little closer you'll see an outline of a cat's body among the branches of the leaf-less tree.

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It comes as another visual puzzle claims that if you can spot all the women in it, then you're a Brainiac.

“My Wife or Mother-In-Law” is one of history's best-known illusions – and researchers believe that your age may determine what you see.

Viewers can see a young woman facing away, or an older, hook-nosed woman facing leftwards.

If you are struggling to make them both out, the clue to look for is the young girl's chin, which doubles as the older woman's nose.

The oldest version of the illusion first appeared on a German postcard in 1888.

The most famous version, seen here, was drawn by British cartoonist William Ely Hill and appeared in the American magazine "Puck" on November 6, 1915.

A 2018 study published by two psychology professors at Flinders University in Australia claimed that whichever figure you see relates to your age.

The study said that older people will notice the older woman first, whereas younger individuals will see the younger figure.

The study included 393 participants (242 males, 141 females) from ages 18 to 68, with a median age of 32.

They were shown the image for half a second and then were asked to reveal the gender and age of the figure they saw first.

Most of the participants saw the younger woman first.

Researchers said that that could be due to most participants leaning towards the younger side.

When the researchers separated the oldest 10 per cent and the youngest 10 per cent of those surveyed, they found that the older set saw the older woman first.

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The younger individuals, on the other hand, saw the younger figure.

The aim of the study was to determine if "own-age biases affect the initial interpretation of an image at a subconscious level."

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