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Which animals are tricked by optical illusions?

Fish and butterflies can flash what looks like a large, staring eye to intimidate predators or deflect attacks ... They raise ...

Optical Illusion: Can you spot the inverted ‘68’ among inverted ‘89s’ in 8 seconds?

Test your sharp vision with a tricky optical illusion. Find the hidden inverted '68' within a grid of inverted '89s'. You ...