A monumental migration
"Egg-laden females journey north in spring, stopping to deposit eggs on milkweed plants. In a few days, the caterpillar eats its way out of the egg casing and feeds on the milkweed. It sheds its striped outer skin multiple times as it grows, and eventually the skin hardens into a hanging shell-like chrysalis from which the adult butterfly emerges."
December 9, 2010 4:00 AM PST
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
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