Yes, the hippopotamus is the largest 4 legged animal.
anything with legs
a snake
An elephant is the largest mammal on land.
I am not sure what you mean but animal which walk on their hind legs have straight legs and they are called bipedalanimals.
no animal can walk backwards, they don't have legs!!
A tripod fish is an animal with three legs, but it cannot walk because its legs are modified fins used for anchoring itself on the ocean floor.
A snake is a small animal with legs that cannot walk. While some snake species have remnants of hind legs, they are not functional for walking. Snakes use their bodies to slither and move around instead of relying on legs for mobility.
A fox is an animal that has 4 legs. It uses these to walk.
squealer
Most reptiles and amphibians that live in water can walk underwater. A number of other animals can walk underwater, including the hippo.
the blue whale (answer by karl )
Hippo legs are quite heavy, with each leg weighing between 300 to 400 pounds (136 to 181 kilograms). This significant weight supports their massive bodies and enables them to walk on land and swim in water. Despite their bulk, hippos are surprisingly agile, both on land and in aquatic environments.