Oooh, that must smart! This slow Worm (Anguis fragilis) tried to remain all nonchalant as fiery Wood Ants (Formica rufa) climbed all over it, until one got on its nose. The Slow Worm didn't like that! Not acting so cool, it moved off at great speed. As you would. Wood Ants spit formic acid, one of the active chemicals found in Stinging Nettles (Urtica dioica), and no one wants that up there nose.