When it senses one, it uses the ovipositor to drill through the wood fibres, to sting the grub and then lay an egg on it. Again, the wasp doesn't immediately kill its target; it uses venom merely ...

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"If you focus on the sound, you'll see it's a little wasp just scraping the top surface of wood." The wasp will go back to its nest with a small pellet of wood in its mouth and create a sort of ...