Taxonomists really outdid themselves with this one. The Mini mum frog (scientific name: Paedophryne amauensis ) is literally the world's smallest vertebrate, measuring a whopping 7.7 mm on average. When the researcher who discovered it needed a name, they just went "hmm, it's tiny... like a mini... mum." And boom, scientific history was made. Somewhere, a grad student is still giggling about getting this past peer review.