Preposterous amounts of testosterone. Preposterone. Ahhnold and Carl Weathers. The muscles from Brussels in spaaaaace.
Picking a chunk of the electromagnetic spectrum to be invisible within.
Seeing in infrared! Interactions between optical camouflage and optical receivers. Why doesn’t all the life on Earth have heat vision? Heat-tracking evolution. Pit viper heat sensors. Human heat-tracking. Biology absorbing infrared. Seeing in greyscale. Wet clay camouflage and effectiveness over time. Mythbusting. Infrared-blocking materials.
Aliens vs Predator for top monster. Ears…? Bleeding. The rainbow of different blood colors available on Earth. Green blood. Luminescent blood. Figuring out why only arthropods seems to have mandibles, and lamenting the lack of them in macro predators.
Appreciating that Blade Runner is pretty much officially the same world as Predator now.
Techno-scuttling. Destroying advanced technology to keep it out of enemy hands. Super-expanding polymers. Amazon delivery drone automatic “dispersal.”