D. ROBERTS / SCIENCE PHOTO LIBRARY D. ROBERTS / SCIENCE PHOTO LIBRARY
Sheep skull. Coloured X-ray of a sagittal section through a sheep's (Ovis aries) skull. Sheep have 32 permanent teeth; 12 molars and eight incisors on the bottom jaw and 12 molars on the top jaw. Sheep do not have incisors on the top jaw, instead they have a dental pad (flat hard gum area, far right).
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