a great many cicadas on a tree trunk - magicicada

cicada empty shells leaf magicicada cicadas superfamily cicadoidea insects hemiptera true bugs prominent eyes wide short antennae membranous wings exceptionally loud song species rapid buckling unbuckling drum-like tymbals exclusively north american genus periodical underground nymphs emerge intervals years depending location unusual synchronization emergence predator evolved sustenance emerging satiate remaining predators survival newly emerged striking mysterious 13yr 17yr nature food-source shell birch tree trunk white dozens scicada dozen gtreat great