Here's why:
* Weasels are in the family Mustelidae, which includes animals like otters, badgers, wolverines, and ferrets. They are generally smaller, more slender, and have long, flexible bodies.
* Hyenas are larger, heavier, and have a distinctive build with powerful legs and a short, thick neck. They are known for their scavenging habits and powerful jaws.
Therefore, despite some superficial similarities, brown hyenas and weasels are completely different families of animals.