Two larvae together. This is a native skipper butterfly, but it is feeding on Black Locust (Robinia pseudoacacia)which is considered an invasive tree species here. The tree, however, is native further south, and it obviously does very well here. Which benefits not only these skippers, but a variety of other insects that are closely associated with the tree.

These larvae turn into striking butterflies: https://pbase.com/laroseforest/image/113441902