But Aliens with Forehead Ridges have much more than a general similarity to Earth Humans.They have the same secondary sex traits - as species-specific as you can get.Indeed, Aliens with Forehead Ridges raise a profound question in evolutionary biology.Convergent evolution might well produce a generally humanoid body plan, just as sharks and dolphins have a similar overall configuration.Four separate sets of glacial/periglacial morphosystems are present at different positions in the Western Tatras starting from valley outlets to the highest cirques, which represent successive phases of deglaciation.R-value means and 95% confidence intervals for selected Last Glacial Maximum (LGM), and Late Glacial (LG-1, LG-2 and LG-3) stages (respectively, 40.1 ± 1.1, 46 ± 0.5, 53.5 ± 1.0 and 60.5 ± 0.3) are significantly statistically different and values for each age category are comparable for the two analyzed valleys.Not only do Aliens with Forehead Ridges mostly look like Earth Humans, they tend to act like Earth Humans as well, or at least one particular (real or speculative) Earth Human culture.A particular race of Aliens with Forehead Ridges may all have a culture like that of medieval Japan, or one based entirely on music, but you will very rarely find more than one culture per species.
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.
What they all have in common is that they are Really Alien.
Exosemanticists have their work cut out understanding them, and exopsychologists in figuring out what they're all about.
Implies human-level cognitive and linguistic ability but not necessarily tool use.
More specific and etymologically correct than sentient.