Can anyone help our Ranger Fred I.D this little critter? He's seen a lot on Dartmoor recently...

As Fred says - 'Looks like larval to me with a green oil like colour to them. The wife has just said we have loads in the garden....'

Drinker Moth catepillar

....on the subject of critters, look at this groovy fella he found  found in the Valency Valley near Boscastle!