What biological limitation is common to the adult Io moth stage regarding sustenance?

Answer

It often lacks functional mouthparts and does not eat.

A significant biological detail about the adult Io moth is that it often lacks functional mouthparts, meaning the winged stage does not eat and must rely on energy accumulated during the larval phase.

What biological limitation is common to the adult Io moth stage regarding sustenance?
insectmothIowinglepidoptera