butterfly metamorphosis. caterpillar development stages. larva and cocoon on branch. insect evolution. animal

butterfly metamorphosis insect animal transformation caterpillar larva cocoon evolution development stage sequence moth worm entomology zoology bug chrysalis pupa change biology invertebrate pest fly creature growth tree branch pupation step life cycle mole fauna transform entomological wildlife wing maggot twig leaf nature plant biological process wild cute funny vector illustration