JRsbugs said:3mm is a very early stage, cats change dramatically as they mature.
Update:
Previous photo from 5 June (3mm), and now - 19 June (4cm).
I expected them to be voracious eaters; I thought all caterpillars were. But there is very little real damage to the plants. This one is on the Antennaria neglecta var. gaspensis. The ones on the Antennaria rosea ssp. confinus climbed the flower stalks and lived at the top, causing a lot of decimation there, and now they seemed to have disappeared....
