A new brain teaser has left people scratching their heads.

The image leaves even the most observant puzzle-solvers racing against the clock to find a hidden squirrel's tail among a flock of chickens.

The optical illusion, shared by the Times of India, shows a brood of chickens clustered together - but hidden somewhere in the crowd is the bushy tail of a squirrel.

But viewers have just five seconds to locate it.

Ready to test your visual skills?