Question Queen Ant/Worker size difference

I found some dead ants in a log and one was the Queen , i thought I'd do a size comparison , the worker is only about 2mm long , the queen is about 7mm .

I've been back to where i found the ants and the grass is all dead so i assume the council had sprayed there a day or so before i came along . I had been scratching my head as to why so many were dead as the grass wasn't wilting yet , mystery solved ! (21/3/22)