I got talking to a guy who fishes wasp grubs.
Their food was the meat they killed in the chase, or seeds and roots, grubs or reptiles.
Beetle grubs feed upon turf roots, ruining lawns.
The ichneumon pierces the body of a caterpillar and lays her eggs where the grubs will find abundant animal food.
European predator anglers were already switched on to this type of lure, using large shad bodies and curly tail grubs in the main.