The Weasels are the main villains of the popular story "The Wind In The Willows" as well as its numerous film adaptations - they are malicious, criminal and slightly feral with a habit of causing trouble for the other animals of the story, who live more peaceful lives.
The Weasels parallel, in many ways, a gang of cut-throats and resided in the Wild Woods, though they made plans to take control of Toad Hall.
The Weasel's song (Secret of Survival) from the 1996 live action movie is a not very famous, but very strange song. In this movie, they look like more than tailed men witch sunglasses, suits and mustaches. In this version, they plan to build a dog food factory to kill the protaginists. When they betray their leader, the weasel chief, by giving him an exploding bomb, they start to fight about who's in charge now. The mole, the rat, the badger and "Mr. Toad" escape from the machines and defeat the fighting weasels. Meanwhile, the believed dead weasel chef escapes, trying to destroy Toad Hall with an explosion. Toad can't stop him, but instead of his house, the dog food factory explodes. It's shown that the badger, the rat and the mole survived and the rat explains that he switched the signs on the tons "bones" and "dynamite", so the weasel chef put the explosion into the dog food factory, probably killing himself along with all the other weasels.