* Size: River otters are typically larger than weasels, with adults weighing between 10 and 30 pounds. Weasels, on the other hand, are much smaller, with adults weighing between 0.5 and 4.0 pounds.
* Habitat: River otters are semi-aquatic animals, meaning that they live both in water and on land. They are found in a variety of habitats, including rivers, lakes, ponds, and wetlands. Weasels, on the other hand, are terrestrial animals, meaning that they live primarily on land. They are found in a variety of habitats, including forests, grasslands, and deserts.
* Diet: River otters are carnivores, and their diet consists primarily of fish, frogs, and other aquatic animals. Weasels are also carnivores, and their diet consists primarily of small rodents, rabbits, and birds.
* Behavior: River otters are social animals, and they typically live in groups called "families" or "clans." Weasels, on the other hand, are solitary animals, and they typically live alone.
Overall, river otters and weasels are two very different animals, despite the fact that they are both members of the same family.
