The first pic is of plings that just left the mom in the last few days. The last two pics are of Scolopenda heros pedes that are one year older than the ones in the first pic. Obviously, one has grown much bigger than the other. I have 40+ plings from last year. There is every size in between these two extremes. Allot of genetics going on here more than diet. I've offered food equally. I feel like I'm seeing aggressive hunting extremes between all of them too which would also contribute to size I would guess. Some go nuts like a mad man if they think food is in their container, others seem pretty scared and cautiously check out the potential prey first.