The essential casing of life, eggs can be rigid, spiked, transparent and leathery. Bird eggs are instantly identifiable but can you guess what creatures hatch out of these other examples? Sharks create collagen based 'mermaid's purses' that are sometimes spiraled to easily wedge into safe rock crevices. Some frogs lay strands of thousands of transparent eggs to hedge the chance of them surviving. Tiny lacewing eggs are perched on the tip of a hairlike stalk that is about 1/2 inch long. This helps to reduce cannibalism of the eggs by sibling larvae. Any way you crack them, eggs are pretty amazing.