While wandering along a bush path, I came across a curious collection of grubs:

They’re spitfire grubs, which are the larvae of a type of wasp called a sawfly. The grubs look quite a lot like caterpillars with a don’t-mess-with-me attitude. They’re black and shiny, with white bristles, yellow feet, and a yellow tail. They’re quite long and fat: about the size of my little finger.

Despite the name “spitfire”, the grubs don’t actually spit anything, but if you touch them you can get a burning sting from the spikes. The grubs also spew out a thick yellow liquid from their mouths when threatened, but the liquid isn’t harmful to people. It’s made from eucalyptus oil, since the grubs feed on eucalyptus leaves.

In the video, you can see them tapping their tails on the rock. They do that to communicate their whereabouts with each other.

Here’s a close-up of some of their heads:

There were ten grubs in the clump:

Next on the scene was a riot of Kookaburras! The birds gathered above me while I was bent over the clutch of spitfire grubs. I was worried that the Kookaburras might swoop down and grab a grub as a snack!

The Kookaburras left the grubs alone. I guess they don’t taste great!

Common name: Laughing Kookaburra
Scientific name: Dacelo novaeguineae
Approximate length: 47 cm
Date spotted: 18 July 2023 (winter)
Location: Manly Dam park, New South Wales, Australia: 33°46’56.0″S 151°15’05.4″E