Cicada exuviae, Big Cypress National Preserve, 2015.

Biologists use the term 'exuviae' to describe the remains of an exoskeleton and related structures after ecdysozoans (i.e., insect, crustacean or arachnid) have moulted. When a nymph hatches from its egg, it drops to the ground and burrows. Cicadas live underground as nymphs most of their lives, at up to a 10 foot depth. In the final nymphal stage before sexual maturity is reached, they exit the burrow to the surface. They must moult (i.e., shed their skin) before they can emerge as an adult. After emergence, the adult cicada abandons the exoskeleton. You will often find them still clinging to the bark of the plant or tree like this.