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We can not only communicate, Trade, and fight, but form joint business ventures, cheat each other at cards, and even fall in love.Indeed, Aliens with Forehead Ridges raise a profound question in evolutionary biology.Nor is it used for Earth Humans who must register with the immigration service.
TRADE with them is sporadic, and even WARFARE seems less frequent than it used to be in the GOLDEN AGE.
This is partly because it is not clear what we would fight them over, and partly because they may have an alarmingly high TECHLEVEL, making war with them a dangerously one-sided proposition. See COSMIC BACKGROUND HISTORY.2) Aliens with Forehead Ridges.
Much more common - especially in HOLLYWOOD SCIFI - than Really Aliens, these are species that look almost exactly like Earth Humans, except for some distinguishing visible feature such as, well, forehead ridges, or odd-shaped ears, or whatever.
It would be expecting much of anyone to guess that an oyster were alive if he came across one (for the first time) with a closed shell.
Could a glance at a clump of trees in midwinter, when all are standing leafless, easily distinguish those which are alive and will bear leaves in the spring from those which are dead and will not?