Krabi

The Crabs. (1976) A sci-fi horror film that is an allegory about the suicidal character of war waged by militant factions. A military scientist (Mr. Cookling) who originally intends to breed perfect robots - crabs, based on the principle "the strongest survive", that would live on metal and would be an ideal diversionary weapon - finds his plans turned against him but it is too late to change it. This, is based onto a sci-fi horror novel from 1958 named Crabs On The Island, which has the same plot as the little movie. (There's different versions! All of them are made from tungsten or titanium as armor, but eats all metal, no flesh nor any other material, just only metal and some other metaloids.)

[1: The original robot crabs, Crab Drones. These adorable lil goofballs are the original mini-factories that made more and more of itself by eating and gnawing metal off with their little buzz saws for teeth, literally. They also cannibalize each other to make bigger and newer types of Metallic Crustaceans.]

[2: A bit bigger, Electro-Lobsters. These types are of course robot Lobsters with a electric antennae to use voltage to kill it's prey.]

[3: A cute little flamethrower of a mini chomnker, little burny. These types are sizes of Coconut Crabs, and has a little flamethrower that can extend and suck up it's burnt prey's remains.]

[4: The larger types, the Krab King; Metal Gargantuan. These crabs are ginormous, as one killed Mr Cooklings by ripping his teeth out when a thunderstorm strike and malfunctioned it. It also can pick and throw small boulders.]

[5: The armadillo type, Iron Shield. These are the defenders of themselves, which have a tungsten bearing as their armor.]

[6: The kinda bigger types, Chubby and Tubby. These two are much smaller but not Crab Drone small, they can pick up large pebbles and throw them at the other types of crabs and lobsters to eat and build.]

[7: The more shy kind, Hermit-Bots. These adorable tin sweeties hide in literal rusted corpses of other robotic crabs if some other crab isn't eating the corpse, AKA it's shell.]

[8: A now farther more larger but terrifying variant, the Copper Spider (actual name: a robotic Japanese or European Spider Crab.). These beasts can attack smaller crabs to sizes of itself, which is a bit bigger to Chubby and Tubby's size.]

[9: Onto the more friendly side, there is the prehistoric kind. The Steel Horseshoe! A robotic horseshoe crab, which like the Iron Shields, have a protective outer shell as the strongest platinum.]

[10: In the stronger and defended side, there are the Alkaloid Clampers. Nickel versions of the Marbled Stone Crab, these big boys are at the height of Electro-Lobsters with two times their clamping force onto the claws.]

[11: On the more creepier side, there are the Yeti-Bots. They are stainless and rustless Aluminum Yeti Crabs, having spikes of random metal from other corpses of other robo-crabs by using strong heat to melt and reshape their prey to what they want.]

[12: Onto the more.. Curvier side, is a Sweet and Sour crab. This tungsten crustacean has a new ability in evolutions of robotic crabs, as it can transform from a cute crab to a woman for getting it's prey's attention. If the robotic woman meets the prey, it would sweet talk within growing it's curves for more and more attention paid from it's prey before just hugging it with it's expanding chest and crushing it, or sitting on it. It can be in different forms of a woman, big and busty, curvy and thick, or most commonly; both. Yes, both the largest bust and butt for maximum attention. Some actually stay in their Graciebon/Amelia Curvy-like forms for 5 or so years, using their prey for giving themselves more improvements for more prey to be caught then last time. Also, for how they can grow their assets (chest, hips, thighs and bum.) is because of infinite capacity water beds inside for a combo of maximum comfort, horniness and manipulation. If met with a human, it would stay in it's female form with more curves and thickness then ever as it may manipulate the person that's it's prey and takes it to it's large den for cuddling. If met with a woman, it would then mimic the woman's behavior, to even having the same body size and look for more curves before taking the female away for cuddling as well.]