| 1 | Mammoth' s tusk which was found during the construction. | |
| 2 | With large tusks and a high rounded head, mammoths were up to 5 meters tall at the shoulder. | |
| 3 | The system is highly advanced. It has been code named Long Tooth by the Pentagon. | |
| 4 | Elephants use their tusks to get food by digging up roots and prying bark off trees. | |
| 5 | Some people thought elephants lose tusks the way people lose teeth. |
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