The dolphins are just often an indicator of a new-user of Bryce, Poser, et al....and the good old "gee whizz - look at this!!!" that everyone saw many years before.
They are on the 'famous' list of what-not-to-do-in-a-wall first penned eloquently by a guy called shoggot eons ago on a site called skinz.org.
[I really SHOULD have submitted that thing I have hiding in moderation].....