specifically head, and it is that big for that reason. I mean it is logical, yet i have never even thought about that until seeing those images. They are basically working and killing machines.
You should see bull ants and stinger meat eating black ants perfectly peeling an unripe mango peel. Both the work finesse of the work and the fact they eat precisely the part which I don't.
(Sometimes they also eat the pulp. But they always eat more peel than anything)
Local rat does something similar to citrus trees. Eats the peel clean off leaving the skinless fruit still on the tree. The fruit doesn’t even rot right away as it is still connected to the tree.