A whopper of a wasp

Megascolia maculata flavifrons (female)

We are fortunate enough to have a rather unusual visitor to our garden, namely a mammoth wasp, or a Megascolia maculata flavifrons. I believe that this is the largest wasp in Europe.

And it really does live up to its "mammoth" name, for it is at least 5cm long. In fact, I have spotted two individuals, the larger one at 5cm or more and a smaller one that is perhaps 4.5cm long. Both of them are impressive creatures.

Both of them are also females. The body of the female mammoth wasp is black with large yellow markings. She has strong wings, tinged with amber, resembling the skin of an onion, showing crimson in the variegated light. Her legs are coarse, with a knotted appearance and are very hairy. She has a huge body and a powerful head, which is well protected by a hard skull. Her flight is quite low and is surprisingly quiet for such a large insect. The male mommoth wasp, which I have not yet seen, is less colourful and of finer frame.

The mammoth wasp does not attack humans (no European wasps do, except out of self-defence, so stop waving your arms about). Instead, it hunts out the larvae of the rhinoceros beetle (Oryctes nasicornis), which it paralyses with its sting in order to lay a single egg in the beetle's body. When it emerges, the larva of Megascolia then devours that of the Oryctes.

Size comparison with ordinary wasp (Vespula vulgaris)

And here's a little video (the quality is far better than the preview image).