Remember “weaselpecker,” that hard-to-believe photo of a weasel riding a bird, Rescuers-style? Those types of animal interactions go viral because they seem rare to us. Yet the phenomena of species riding other species isn’t actually that unusual. In 2004 and 2006, researchers documented two instances of a humpback whale (Megaptera novaeangliae) giving a lift to a bottlenose dolphin (Tursiops truncatus) near Hawaii... Here are some other instances of animal-on-animal action...