I'm not sure if I was paying more attention to them or it was because I was there earlier in the season but there seemed to be a lot of caterpillars around this year. Identifying the species usually requires raising one together with some leaves of its hostplant until it pupates, and then being around when the adult finally emerges! Nevertheless, certain families show certain characteristics and the above one is probably in the Erebidae family of moths. Below is a typical slug caterpillar in the family Limacodidae, known for their bright colouration and spiky protrusions.
