A caterpillar that can cause severe illness in humans and pets should be reported, but people are advised not to touch them. The Forestry Commission is asking the public to report sightings of oak processionary moth caterpillars, which emerge from May to July before becoming adult moths. However, because the creatures and their nests contain long hairs that cause itchy … [Read more...] about The public is urged to report any sightings of caterpillars that should not be touched