Cocoon of salt marsh caterpillar, <i>Estigmene acrea</i>, opened to reveal oblong, dark red puparia of a parasitic (parasitoid) tachinid fly and shriveled skin of mature larva (caterpillar) it killed.
Cocoon of salt marsh caterpillar, Estigmene acrea, opened to reveal oblong, dark red puparia of a parasitic (parasitoid) tachinid fly and shriveled skin of mature larva (caterpillar) it killed.
Credit: Earl R. Oatman