|Army worm crossing water|
|Army worm climbing nardoo stem|
It has taken me a long time to figure out how they even got into the bath and why I never saw any small size caterpillars, for that's what they are in reality, moth caterpillars. But all is discovered. They climb up grass stems leaning against the bath.
The nardoo fern looks much the worse for wear. Most of the leaves that stand up above the water are eaten.
One thing I haven't yet seen is any orchid dupe wasps taking on the caterpillars on the wetland. So perhaps eating nardoo, on a wetland, can be seen as a survival stratagem.