acoustic bug buzzer cicada Cicada song closeup critter dog-day cicadas empty exoskeleton food hibernate insect instar larvae macro metamophose metamorphosis molt molting Noisy nymph pest protein source shed shell skin animals Arabian brown bushy-eyebrows camel camel-wool camelids camelus-dromedarius coat cow curly-eye-lashes domesticated dromedary efficient endurance even-toed-ungulate fawn feral hair hardy hump leathery-pads mammals moult moulting Ships-of-the-Desert strength strong tough two-toed ungulates wool woolly bushy eyebrows calf camel wool camelus dromedarius curly eye lashes even-toed ungulate leathery pads Ships of the Desert