A bumble bee.......

This huge bumble bee floated past as I was finishing my coffee outside....contemplating tackling the weeds again!!!
It was HUGE....about twice the size of a normal looking bumble bee. A friend at the spinners and weavers yesterday remarked that she seen an enormous one recently.....and I remember saying oh really....but here it is...about an inch and a half in length and hugely FAT....what kind is it...I've never seen this sort before........???????