Beavers build dams by instinct alone

Beavers are nature's engineers, building complex dams up to 2,790 feet long purely by instinct. Even baby beavers raised in captivity, never seeing a dam, will construct one if given materials. This innate drive is so powerful they'll even try to dam the sound of running water. Their incredible dams create vital wetlands, boosting biodiversity by 75%, filtering water, and preventing floods. They can fell trees five feet in diameter with their iron-rich, ever-growing teeth.