Input (grade 11): Ivory can be taken from dead animals â "Russians dug up tusks from extinct mammoths â" however most ivory came from elephants who were killed for their tusks.
Output (grade 9): Ivory is a hard white material made from the tusks and teeth of animals such as elephants, hippopotamuses and walruses. Ivory is now very rare and expensive since there are restrictions on hunting elephants for ivory.