They secrete a goo that smells like vanilla
In fact, it’s sometimes used in vanilla flavorings. Castoreum is a chemical compound that mostly comes from a beaver’s castor sacs, which are located under the tail. It is secreted as a brown slime that's about the consistency of molasses and smells like musky vanilla. It’s an FDA-approved natural flavoring.
Their dams can be enormous
The world’s largest beaver dam stretches 850 meters deep in the thick wilderness of northern Alberta. It was discovered after being spotted on a satellite image in 2007, but scientists believe multiple generations of beavers have been working on the dam since the 1970s. Last September, explorer Rob Mark became the first person to ever reach the dam.
They once traveled by parachute
In 1948, new human inhabitants of western Idaho began to clash with the local beaver population. The Idaho Department of Fish and Game wanted to put these threatened beavers in a nearby protected area, but they didn't know how to get them there. Elmo Heter of Idaho Fish and Game devised an ingenious solution: By using surplus parachutes from World War II, the department could drop boxes of beavers down from planes. After some careful calibrations, 76 beavers made the skydive into the basin, and all but one survived the fall.