give your own muto backstory

hey this is my first discussion so be free to call out any mistakes i made thanks.this discussion is on how i think the mutos came to be. i think that a small island has a large population of spider ant. the area is contaminated by radiation after it has leaked from a nuclear power plant that was destroyed by the earthquake/tsunami in japan that happened awhile back and they soon mutate.there growth accelerates (some grow extra limbs witch explains the 8 legged ones)and they grow wings and fly over to the main land. when they get there most quickly lose there wings though some keep there wings. so thats my explanation whats yours please comment:)