we found this in a city
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"The normally green caterpillar turns pink/purple and leaves the tree when fully grown and looking for a pupation site underground."
I didn't know that!
Because this observation was made in a street, you can see the lime trees the caterpillar must have been feeding on by using Google Street view. Just click the location to open the map, click 'Satellite', zoom in and then drag the little person icon onto the street.
University of Edinburgh and Biodiversity Observatory (OU)
Lat/Lng: 48.143166666667, 11.587666666667