Interaction between man and dolphins, written by Dante
Here is a lovely quote about the interaction between man and dolphins written by Dante in his Divine Comedy written in Italy in the early part of the 14th Century.
See http://en.wikipedia.org/wiki/Divine_Comedy for more.
In Canto 22 (in translation from the original)
“Just as dolphins do, when with the arched back, they signal to the seamen to prepare for tempest, that their vessel may be spared.”