[lapsed_pacifist]

>Tyranids giant biological hive mind that rapidly adapts to new environments consuming or infecting existing species to plunder their genetic advantages.

Sounds like GW copied that from Heinlein's Starship Troopers, or maybe Enders Game.

Ditto the Space Marines.

Culture is just copying/remixing, all the way down.

[Retric]

Enders game’s alien are quite different from both they aren’t a single unified hive mind but a species of queens and mindless drones using biological technology rather than literally being the ships or having a wide range of forms, also no rapid evolution or gene stealing etc. Starship Troupers share even less they don’t even use starships, aren’t a unified hive mind, etc their both great example of sci-fi space biological armies being a fairly huge space for different ideas.

Remixing at least involves using multiple sources, my only real issue is SC both only copied from 40k and changed so little. It’s like the figured after just crossing just past the line of copyright infringement was enough and they would go no further. But hey they did the same with the original Warhammer game to make Warcraft and that worked out just fine for them.