Spring time does not only mean that butterflies start flying. It also means that caterpillars break up hibernation and continue the metamorphosis.
This winter I found a caterpillar of the Purple Emperor (Apatura iris). It has been a particular joy to see the caterpillar waking up to feed again. The caterpillar first rested for about 6 months on the same twig.
Here’s some photos taken immediately after the caterpillar reached fresh growth.