These are probably the best mounts to use while taming basilosaurus. The basilosaurus usually has a large group of stingrays around them. I have found one without the usual mob surrounding it, but it’s still a good idea to a baryonyx along for safety. What makes them helpful during the taming process is their ability to stun multiple creatures and then to dispatch them quickly. To do so I think you have to tap the left trigger(this is for Xbox)to do its stun attack. After stunning the rays you just bite them and swim to the basilosaurus and passive tame it.

-M.L.