It's a geometer moth larva, otherwise known as an inchworm, named after its distinctive looping and lunging gait. The caterpillar appears to measure its path in units of its own body length.

Are inch worms actually worms?

The name inchworm refers to the larvae of moths in the Geometridae family. ... Although referred to as a “worm,” the larvae of these moths are actually caterpillars. The larvae feed on the leaves of various plants such as apple, oak, mulberry, and elm trees.

Do Inchworms turn into caterpillars?

Inchworms aren't caterpillars of a single species; they are the larvae of many different geometrid moths.