San Diego Zoo’s 141-Year-Old Tortoise Dies
- Here's a breakdown of the information from the provided text, focusing on key facts about Galápagos tortoises:
- * Arrival in the Galápagos: They are believed to have arrived by swimming from the South American mainland, using their long necks as "snorkels" and their buoyant, bell-shaped...
Here’s a breakdown of the information from the provided text, focusing on key facts about Galápagos tortoises:
* Arrival in the Galápagos: They are believed to have arrived by swimming from the South American mainland, using their long necks as “snorkels” and their buoyant, bell-shaped bodies for stability. This journey likely took around six weeks.
* Origin of the Population: Genetic evidence suggests the entire Galápagos tortoise population descended from a single female who arrived 2-3 million years ago.
* Sperm Storage: Female Galápagos tortoises can store sperm for up to seven years.
* Size: Males can weigh over 500 pounds and reach 6 feet in length, while females are about half the size. However, larger tortoise species once existed on the South american mainland, so their current size may not be exceptionally oversized in an evolutionary context.
* Subspecies: There are 15 subspecies of Galápagos tortoises, with three already extinct.
* Recent News: A pair of Galápagos tortoises recently laid an egg at Midway atoll National Wildlife Refuge in late November.