What do Karner blue caterpillars look like?
Karner blue caterpillars (larvae) are pale green and 2 to 14 millimeters long, depending on their age. They are usually found feeding on wild lupine leaves and are often guarded by ants that collect a sugary solution secreted by the caterpillars’ bodies. It is very difficult to distinguish between Karner blue caterpillars and similar butterfly larvae.
