This 124-year-old drawing has both if you can spot them It's an optical illusion that would have driven Elmer Fudd to distraction. Feb. 15, 2016, 9:08 AM EST / Source : TODAY ...

The duck-rabbit drawing was first used by American psychologist Joseph Jastrow in 1899 to make the point that perception is not only what one sees but also a mental activity.

Thanks to 3D printing, the lucky duck is now able to walk around like any other duck at the pond with her new prosthetic foot. Continue reading below. Our Featured Videos.

With a little bit of silicon and a 3D printer, Buttercup the duck is now waddling around Feathered Angels Sanctuary. When Buttercup hatched on November 12, 2012 his left foot was turned backwards.