Mammoth wasp : Megascolia maculata flavifrons (female)

Often called "Mammouth wasp" it is the biggest wasp in europe, 5 cm long! I have to admit that I was quite scared while taking these macros instead this beast was not scared at all by my camera.
It's absolutely not dangerous for humans and it only feeds on pollen... so why these huge jaws?
The reason is that it paralyzes caterpillars, usually the huge larva of the rhinoceros beetle, to lay eggs on it. The new born, devouring it from inside, will have a massive amount of food to grow until making a cocoon and becoming an adult. The male is smaller, black head and longer antennae.