Given two intelligent species on a planet, where should the smarter one make its home, considering the possibility of extraterrestrial invasion?

Yes, sure, a likely scenario. But Douglas Adams dealt with it in his famous travel treatise (humans vs. dolphins … and mice). So did an odd dream last night, which included an amphibious llama with a cargo uterus (don’t ask, I won’t tell).

Anyway, studying my one or two dozen millithoughs on military strategy, I would have to favour the subsurface species. Let the aerial ones take the heat burns of screaming space ship engines; let the surface ones be stomped by block-sized landing feet. Those hiding below can plan their escape in the mean time.

Bring it on, baby. I’m growing gills.