Water repellant fur,live near and spend much of their time in water.
they both like the water.
Otters are aquatic mammals known for their streamlined bodies and webbed feet, while water rats, or water voles, are rodents that live near waterways. Otters are carnivorous predators, while water rats are herbivores. Otters are known for their playful behavior, while water rats are more elusive.
The DNA of humans and rats is about 85-90 similar in terms of genetic makeup.
Water birds, rats, ants, snakes, frogs, otters, other crabs, fishes, sharks, octopuses, human... water pollution, destruction of habitats...
Manatees and river rats and possibly otters.
In rivers i have seen around the world you could find fish of all kinds, crocodiles, hippos, otters, water rats, beavers, eels, snakes and toads.
no rats have gills, incuding water rats
Rats have similar bodily systems and organs to humans, and react in very similar ways.
Humans and rats share about 90% of their genes, making them quite genetically similar. However, there are significant differences in the organization and function of these genes, resulting in notable differences between humans and rats in terms of behavior, anatomy, and physiology.
River rats, also known as river otters, are semi-aquatic mammals with long, slender bodies, webbed feet, and thick fur. They have a sleek appearance with pointed faces, small ears, and long tails. River rats are excellent swimmers and are often seen playing and foraging in or near water bodies.
It is similar to other rodents, such as guinea pigs, rats, and hamsters.
They look similar. That's about it.