The Herald Moth spends the winter as an adult, and is consequently
one of the first moths to herald in the spring, which is doubtless why it has
borne the name Herald since 1782. The caterpillar is to be found from June to
September on willow. It has a whitish bloom underneath, and it wriggles violently.
Pupation is in a semi-cocoon - that is, it folds some leaves together with silk
to make a sort of cocoon, but it leaves the top open. The pupa is dull black.
The tongue of the adult is supposed to be strong enough to pierce the skins
of fruits, though I have not witnessed this myself.