There's several cool bugs that should be added to the game. Giant mutated spiders seem like an obvious creature to add to the game, yet in all the Fallout games there hasn't been spiders. I wonder if it's a design choice not to have them, since just about every fantasy RPG has spiders. The bug I would like to see most is an Earwig. Those bugs are creepy, and would be pretty scary as a giant mutated insect in a Fallout game.
Other cool bugs:
-Moths, imagine giant mutated moths.
-Worms/caterpillar
-Dragonflies, just might be more annoying than Cazadors.
-Bees
-Fireflies, imagine these creatures only come out during the night time hours. When attacked they use their luminous glow to release radiation, similar to the Glowing Ones ghouls.
There should be spiders. Mutated spiders would be awesome.
Mutated moths would be awesome too.
Mutated earwigs, that would be creepy, but the more mutated animals the better, lol.
Mutated Radioactive Fireflys would be awesome.
Bees I don't like so would'nt be bothered about so much. But mutated bees would be cool.
I would like to see mutated butterflys. That try and svck your blood.
There are all sorts of insects that would be awesome as mutated insects in fallout games.