I found this creature a couple of inches below the surface of a perennial garden near Stratford, Ontario. Close by are succulents (hens and chicks) and roses. The soil is quite loose with lots of mulch. Because I couldn’t identify it, I left it in the garden. I’m curious though, as I garden a lot and don’t remember seeing one like this before.
Your caterpillar is a hitched arches caterpillar. It turns into an interesting mottled grayish moth.
They are not a pest…there are never very many in an area to cause any damage.
These caterpillars feed on a wide range of plants in brushy areas, clearings, wood edges, etc. They eat leaves of plants like dandelion, goldenrod, plantain, treefoil, alfalfa, clover and wood plants like birch, elm, honeysuckle and willow.
There are two generations per year. They are really a pretty caterpillar.