A starfish
Well, no ANIMAL has eight legs but an arachnid called SPIDER does
No
Sea turtle.
The spiders and the scorpians
Insects only have six legs and are not mammals.
During development of a jellyfish, this mysterious sea animal goes through a stage of having 24 legs and no eyes. A jellyfish spends it's entire life in the water.
One animal that you might see go near water, but never get its sea legs would be a cat.
Arachnid is a animal with 8 legs, like spiders,whipscorpion,scorpion,pseudoscorpion,whipspider,solpugid, and a harvestman.
There is no known animal that fits that description. It is possible that you may be referring to a fictional or mythical creature.
A snake? A worm? A sea snake/worm/serpent thing? Is it a trick question?
no animal can walk backwards, they don't have legs!!