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The cover images in volume 213 of the journal all feature mouths and teeth from different members of the animal kingdom. The toothy-grin of the Nile crocodile is featured on this issue's cover. Crocodiles have 64-68 conical teeth. Crocodiles replace their teeth regularly and a single crocodile can go through at least 3,000 teeth in its lifetime; though the replacement rate slows significantly with age.