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.