cluster of gypsy moth chrysalis chrysalises on oak tree bark macro close up

gypsy moth chrysalis chrysalises metamorphosis caterpillar pupa cluster pupae closeup common bark damage arthropod crawling entomology mass sac eggs forest sack egg hairy head insect larva antenna lepidoptera lepidopterans lymantria dispar macro natural nature plant wild wildlife defoliation leaves pest pests destruction invasive species tree infestation infest sacs