Another convenient “error” means that you duplicate your legs on each segment, instantly doubling your leg count. This doesn’t actually make you faster, but it does make you stronger. You can shove into piles of leaf mold to find the choicest bits of … rotting leaves. Nice.

This is a good enough strategy that you spread across the whole world, growing up to 30cm in length, and live through various extinction events into the present day.

You are a millipede.