a tail
yes
moving their tail
Their tail and teeth.
Dolphins paddle by swishing their tail up and down or side to side.
Dolphins do have a strong tail with strong kick. That is showcased in many aquariums when they perform tail-walking above water or jumps.
silk as the cover
Yes. Most dolphins can't survive without a tail because they need a tail to swim, they would most likely drown without a tail, but that doesn't mean it's completely hopeless. If Winter the dolphin can survive without a tail, another dolphin can survive too, as long as they put their fighting spirit to use for survival
dolphins grow to about 3 metres
Up and down. I've also noticed that mammals, such as whales and dolphins, beat their tail up and down, while fish, like sharks, beat their tail side to side. Hope this helps!
it is like a trangiler
its almost as strong as chuck norris