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Elephants have four teeth, all molars, which have jagged ridges for grinding leaves, stems, and roots. A single tooth can weigh more than 5 kg (11 lb) and measure 30 cm (12 in) in length. The first pair of molars is located toward the front of the mouth. When these front molars wear down, they drop out in pieces as the two molars in the back shift forward. Two new molars then emerge in the back of the mouth to replace those that have moved forward. Elephants replace the back molars six times throughout life. When the last set of molars wears out—anywhere between 40 and about 60 years of age—an elephant can no longer chew food and dies of starvation, a not uncommon death among elephants.
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Elephants usually have 26 teeth: the incisors, known as the tusks, 12 deciduous premolars, and 12 molars. Unlike most mammals, which grow baby teeth and then replace them with a single permanent set of adult teeth, elephants have cycles of tooth rotation throughout their lives. The chewing teeth are replaced six times in a typical elephant's lifetime. Teeth are not replaced by new ones emerging from the jaws vertically as in most mammals. Instead, new teeth grow in at the back of the mouth and move forward to push out the old ones, similar to a conveyor belt. The first chewing tooth on each side of the jaw falls out when the elephant is two to three years old. The second set of chewing teeth falls out when the elephant is four to six years old. The third set is lost at 9–15 years of age, and set four lasts until 18–28 years of age. The fifth set of teeth lasts until the elephant is in its early 40s. The sixth (and usually final) set must last the elephant the rest of its life. Elephant teeth have loop-shaped dental ridges, which are thicker and more diamond-shaped in African elephants.
http://en.wikipedia.org/wiki/Elephant#Teeth
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Εμένα μου άρεσε αυτή:
http://www.eleaid.com/index.php?page=elephantteeth
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) την Encarta:Elephants have four teeth, all molars, which have jagged ridges for grinding leaves, stems, and roots. A single tooth can weigh more than 5 kg (11 lb) and measure 30 cm (12 in) in length. The first pair of molars is located toward the front of the mouth. When these front molars wear down, they drop out in pieces as the two molars in the back shift forward. Two new molars then emerge in the back of the mouth to replace those that have moved forward. Elephants replace the back molars six times throughout life. When the last set of molars wears out—anywhere between 40 and about 60 years of age—an elephant can no longer chew food and dies of starvation, a not uncommon death among elephants.
Σε βιντεάκι:
Και τώρα η Wikipedia:
Elephants usually have 26 teeth: the incisors, known as the tusks, 12 deciduous premolars, and 12 molars. Unlike most mammals, which grow baby teeth and then replace them with a single permanent set of adult teeth, elephants have cycles of tooth rotation throughout their lives. The chewing teeth are replaced six times in a typical elephant's lifetime. Teeth are not replaced by new ones emerging from the jaws vertically as in most mammals. Instead, new teeth grow in at the back of the mouth and move forward to push out the old ones, similar to a conveyor belt. The first chewing tooth on each side of the jaw falls out when the elephant is two to three years old. The second set of chewing teeth falls out when the elephant is four to six years old. The third set is lost at 9–15 years of age, and set four lasts until 18–28 years of age. The fifth set of teeth lasts until the elephant is in its early 40s. The sixth (and usually final) set must last the elephant the rest of its life. Elephant teeth have loop-shaped dental ridges, which are thicker and more diamond-shaped in African elephants.
http://en.wikipedia.org/wiki/Elephant#Teeth
Θέλει μια προσπάθεια να καταλάβεις το ίδιο πράγμα από τις δύο γραπτές πηγές.
Εμένα μου άρεσε αυτή:
http://www.eleaid.com/index.php?page=elephantteeth
Να είχαμε και κανένα ωραίο καρτούν!
