I, for one, welcome our new Quagaar overlords!
Any species that's figured out how to traverse the cosmos and all of the figurative hurdles therein gets my awe and respect.
And, of course, getting outside the spaceship to traipse around the joint. Then again, if it's true that bacteria and fritters reviving having been dormant in now-melting glaciers that ended up frozen when glaciers took off like hotcakes during the formation of the last ice age and everyone's in a tizzy in how zillions of humans and other species might die because of those, and those are all on the same planet... Never mind any beings from another planet and what they're bringing along with their matching baggage, cookbooks, and guitars to sing folk songs with?
Do they come from a planet that supports life as we know it? Or rather, at least as compatible in terms of temperature, gravity, oxygen, and so on, requirements? Life could develop elsewhere and under conditions that we might otherwise think are impossible. But compatibility being one issue, communication might be that much more difficult as well...
Silicon-based? Silicone-based?
A species that developed with the ability to breathe helium might be fun... if it expels hydrogen, it's got its own fuel source to toot out. If humans could eat beans and toot out rocket fuel, we'd all be interstellar.