I raised my previous brood on hawthorn which they ate with gusto. But a friend on the excellent Upper Thames Moths blog told me that his had been reared on bramble - blackberry - leaves which they ate voraciously.
The evidence for Caterpillar Conservatism is in the pictures above.
I'm interested too in the different, lighter colouring of a couple of the caterpillars, which may be a step ahead of their siblings in development? Or is it just the effect of sun light on their young and perhaps somewhat translucent bodies?
Finally, I noticed these slender prisms on our kitchen window this morning and hopefully wondered if they might be yet another virtue of that incredible stuff, spider silk. But our domestic regime is exonerated. They seem to be wafer-thin smears of window-cleaning stuff left behind after a vigorous polish by P last week.