Beaten from a Salix sp. at woodland edge.
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I have only seen the Butterfly but never the caterpillar,they look like hairy slugs,excellent find.
Now we have lots of willows near us... I've never seen a Purple Emperor, but those caterpillars look pretty easy to recognise - might go and look tomorrow! Hairy slugs is a pretty good description.
OH! The insults!
A but just think what a beauty lies beneath,and its a rather attractive hairy looking slugs (caterpiller) they are weird and wonderfull arn't they.
Well their appearance didn't put me off shaking a few willow branches today. But all I got were dead willow bracts. I still enjoyed the idea that I might find some caterpillars though!
Lat/Lng: 51.3, -0.2
OS grid ref: TQ2657