Maggots feed as a pack instead of separately so as to grow faster from the heat generated.
Maggots are soft, legless larvas of a fly or other dipterous insect, that often eats decomposing organic matter.
Maggots often feed on this decomposing organic matter as a pack of group because they generate heat in a collective state.
This heat facilitates their fast growth and helps them develop into the pupa stage at a faster rate.