India, Aug. 31 -- Optical illusions have gained popularity once again and keep popping up online, and the one with the bird is making people scratch their heads. A picture shows a bunch of bright birds sitting together. All looks normal at first. Parrots with wings wide, pigeons, and even a peacock showing its tail. But hidden in the mix is one bird that just does not belong.

Most birds here can fly and have wings. But one is stuck on the ground and cannot fly. If you take a glance, your eyes will skip right past it. That is how the trick works. Your brain expects every bird to be the same, so you miss the odd one out.

Tried solving this challenge but still cannot figure out the answer? Look closer. Bottom row, first bird from the left....