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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 cover of this issue depicts a young cheetah cub. Unlike other cats, the cheetah has a weak jaw and small teeth - perhaps the price it paid for speed. Although cheetah cubs are blind and completely helpless at birth, they develop rapidly and at 3 weeks their teeth break through their gums. The cubs grow rapidly and at 8 months old, they have lost the last of their deciduous teeth.