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Mojave Desert Tortoise - Gopherus agassizii
The upturned extension of the plastron (lower shell) is a gular horn.
Males use these in fighting with other males, to flip an opponent on its back.
Tim May | 07-Aug-2009 19:43 | |
coaster | 05-Aug-2009 22:16 | |
Carol E Sandgren | 05-Aug-2009 17:58 | |