For six weeks, luna moth caterpillars gorge themselves on the leaves of the marula tree. Then, when they're ready, they instinctively weave giant cocoons around themselves in preparation for their stunning metamorphosis.
Did you know dinosaurs had wishbones? Yup. When this guy was restored for display purposes, it was noted that his "furcula" was original. We think if you're pulling on a dinosaur's wishbone, you'd best get your wish.