Caterpillars eating my cherry tree

Caterpillars eating my cherry tree

Observation - Caterpillars eating my cherry tree. Description: A mass of caterpillars are stripping the leaves off my cherry tree. Any ideas what they are ? Edit...What's not clear in the photos are that their heads a black with a yellow upturned 'V'.

A mass of caterpillars are stripping the leaves off my cherry tree. Any ideas what they are ?

Edit...What's not clear in the photos are that their heads a black with a yellow upturned 'V'.