Female Giant Tortoise of Unknown Ancestry No offspring are kept in the enclosure for female tortoises of unknown ancestry. The shape of their shell gives clues, but interbreeding has occurred and the Darwin Center wants to keep the species from each island pure so they can be repatriated. Different shell shapes evolved over time as an adaptation to the type of food available. This tortoise is under a Thorn Shrub (a buckthorn). Puerto Ayora, Santa Cruz.
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