The latest study has shown that birds are not that easy to fool.

A research, which was carried out by Auckland University researchers in the collaboration with The University of Birmingham in Britain and Palacky University in Czech Republic has shown that some species of birds have the ability to identify their own eggs from the eggs of the ‘rouge’ birds.

‘Rouge’ birds are basically those birds, which lay their eggs in other bird’s nests and fool them into hatching their eggs. It includes the name of world famous cuckoo, which is quite notorious at such kind of tasks.

But song thrushes, a species of birds, have the ability to identify the ‘rouge’ eggs in their nests through the difference of the color.

The researchers came to this conclusion after they had introduced eggs into the nests of song thrushes in Australia and New Zealand that were painted in different colors near to birds’ own eggs.

To their surprise, they found that the birds ejected eggs of a range of colors from their nests, mainly those with difference in reflecting ultraviolet or short (blue) wavelength light.

Mark Huber who led the study said that the birds have the ability to see ultraviolet rays which we cannot see.

He further said that their research shows that the peculiar abilities of birds to perceive broad spectrum color is vital in recognizing their own eggs, and they can recognize small differences and wavelengths, which human beings wouldn't be able to differentiate.

The study was published in the online edition of ‘Biology Letters’ Journal.