National Geographic : 1953 May
696 © Graphic Photo Union + The Larvae Gorge for Five Weeks Before Spinning Their Silken Shrouds These three-inch caterpillars have eaten continuously since hatching. Each has devoured about three-fourths of an ounce of leaves. Eating, they make a sound like rain. Apertures in their sides serve as breathing tubes. + A cocoon maker emits liquid silk from two head sacs. Contact with air solidifies the secretion. First strands form a hammock to support the cocoon. Silken figure eights spun in the next three days will enclose the body.