Since we're all animals, given satisfaction of basic needs of air, food, water and temperature control, libido is next in line. Same for all species. Having satisfied that drive some of the beavers decide that they're much smarter than other beavers and try to tell them what they can, can't and must do with their ponds - or else. So the majority of beavers choose a big beaver named Trumpet who tells the "smarter" beavers to lump it. The "smarter" beavers don't like that at all, but, as the cows say, the point is "moooot".