Panda Doesn't Realize She's Had Twins

Pandas often give birth to twins, but only nurse one of them, which is a tragic waste of pandas. Scientists have found a workaround that relies on their innate obliviousness, as you can see in this clip from BBC Earth. One may argue that this only perpetuates the survival of less-intelligent pandas, but that's akin to closing the barn door after the horse has escaped. (via reddit)