In a photo provided by Clint Penick, Indian jumping ants, which can leap high, take out prey and economise the size of their brains. In a study published in the journal Proceedings of the Royal Society B, scientists found that Indian jumping ants can shrink their brains by nearly 20 percent and enlarge them in a matter of weeks. Clint Penick via The New York Times

These ants shrink their brains to become queen

If their bids at motherhood fail, the Indian jumping ants, which can leap high, can then regrow their brains