The Galápagos Islands, which provided impetus and inspiration for Charles Darwin's seminal work, "On the Origin of Species", are home to unique populations of reptiles.

For some female iguanas, snaring a prince comes at a price. A team led by Princeton scientists has found that among the marine iguanas of the Galápagos Islands, females spend a great deal of energy picking a mate from their many suitors -- sapping strength the females might have used for finding food, escaping predators or producing eggs.