Dolphins are pretty smart! Mean like us, too. If we and they didn't inhabit incompatible environments, I suspect we'd have had some complicated history with them, and probably now speak of them in the past tense - or they'd speak so of us.
Fortunately, ravens are smart enough to recognize the combination of repeated food offerings, and a demurral to repeat the initial rudeness, as earnest of good intent - walking out the door with my camera no longer provokes alarm calls and surveillance overflights. Catbirds, not so much - I pissed off one of those back when there was snow on the ground, and I suspect he'd still quite happily rip my lungs out if he could.
ONe intelligent species on Earth? So you are assuming most animals are moving objects without any thought or emotion?
Finally, by the time we'd be able to visit another planet, we'd probably prefer sitting in our Holodecks all day.