Some species of ground wasp dig a chamber for the lava and then return with paralysed food for them..
Ground digger wasps or cicada killer wasps dig finger sized burrows with a spoils mound near the entrance.
There was a chapter in the last Michael Crichton thriller involving humans shrunk to millimetres Vs hungry 'giant' wasp in burrows. It must have affected me more than I thought else I would have never remembered this little nugget!
buzzzz lightyear (graham)