Weasels are odd creatures. The least weasel, mustela nivalis nivalis, is quite possibly the smallest carnivore on the planet. They are designed to enter very small tunnels and eat whatever is inside them. If a weasel's head can fit in a hole, so can the rest of it.
When a weasel catches prey, it starts at the neck, paralyzing the snack. If it isn't particularly hungry, it will eat the brain first, which is like a fistful of sour gummi worms to a weasel, a scrumptious desert. If it is very hungry, a weasel will eat more. Weasels cannot digest vegetables and carbohydrates, their bodies aren't made for that. But they still need some to live, so what weasels do is wait until their prey has eaten, and then, in between the time when vegetable matter is digested and when it is absorbed into the snack, a weasel will yoink the digested carbohydrates right out by means of eating the intestines. This is pretty cool. What's a bit of a bummer is that weasels can only hold 1/100th of an ounce in their stomachs. They have to eat at least ten times a day to survive their own metabolism. This is not as bad as a shrew or a hummingbird, but it is still pretty ridiculous for a carnivore.
Weasels are good swimmers, and good climbers, too. When climbing down a tree, a weasel can flip their hind paws around backwards to grip the trunk as if they were climbing up the usual way. Squirrels can do this, too. When viewed in darkness with a light shone on them, a weasel's eyes do not reflect red like a cat's, but rather green.
So now you know a bit about weasels.
This song is not about weasels. This song is about freakin' /vampires/.