Bluffing is the oldest trick in the poker-player's book, comes in the rather adroit in the wild life, too.
The peacock butterfly, a absolutely tasty catch for a bird, often rig death with a pretense.
Suddenly unmasking the striking eyespots on the butterfly's wings is enough to jump a foraging bird saving its life, described by Adrian Vallin, a zoologist at stockholm university, Sweden.

Although, insect's wings assumed to be an anti-predator, there had been little observational proves to support it. Vallin experiment it by blacking out the eyespots of butterflies with a marker pen, and putting them at the blessings of bird. Experiment team found that thirteen out of twenty butterflies were eaten by predator. Just 1 of 34 survived from bird.
The major question is why do not bird learn identify the peacock butterfly. The simple answer is bluff, says Graeme Ruxton, an ecologist from the university of Glasgow, UK.