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Teeth are classified as incisors, canines, premolars (also called bicuspids), and molars. Incisors are primarily used for cutting, canines are for tearing, and molars serve for grinding. Most teeth have identifiable features that distinguish them from others. There are several different notation systems to refer to a specific tooth.
A lion biting another lion's tail as play behavior. Biting is an action involving a set of teeth closing down on an object. [1] It is a common zoological behavior, being found in toothed animals such as mammals, reptiles, amphibians, fish, and arthropods. Biting is also an action humans participate in, most commonly when chewing food. [1]
The specific derived morphology of the teeth on the mandible varies depending on whether the insect eats broad-leafed herbs or grasses. [ citation needed ] This same simple structure is seen in all of the remaining Polyneopteran insect orders, with the exception of the Paraneoptera ( Hemiptera , Thysanoptera , and Phthiraptera ).
Typically the mandibles are the largest and most robust mouthparts of a chewing insect, and it uses them to masticate (cut, tear, crush, chew) food items. Two sets of muscles move the mandibles in the coronal plane of the mouth: abductor muscles move insects' mandibles apart ( laterally ); adductor muscles bring them together ( medially ).
Rabbits and hares were once considered rodents, but are distinguished by having six—one small pair, called "peg teeth", is located directly behind the most anterior pair. Incisors are used to bite off tough foods, such as red meat. Cattle (cows, bulls, etc.) have none on top but a total of six on the bottom.
These teeth are used for cutting wood, biting through the skin of fruit, or for defense. The teeth have enamel on the outside, which is often orange-yellow due to the incorporation of iron-containing pigments, [ 6 ] and exposed dentin on the inside, so they self-sharpen during gnawing .
Ants have long, broad, serrated jaws, used for digging, collecting food, fighting and cutting, and are probably the most important work tool ants possess. Ants typically bite each other when fighting. Some ants use mandibles to injure the enemy and squirt poison into the wound. Harvester ants use their mandibles to collect and carry seeds.
The teeth in the upper and lower jaws in mammals have evolved a close-fitting relationship such that they operate together as a unit. "They 'occlude', that is, the chewing surfaces of the teeth are so constructed that the upper and lower teeth are able to fit precisely together, cutting, crushing, grinding or tearing the food caught between." [5]
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