Examine evolved differences between Galapagos tortoises across Galapagos Islands
Galapagos tortoises (Geochelone elephantopus) filmed in their native habitats.
Encyclopædia Britannica, Inc.
Transcript
NARRATOR: The Galapagos Islands take their name from the giant land tortoises found there. Tortoises from different islands can be identified by the shape of their shells, which appear to have evolved into two main types with slight variations.
Tortoises with a dome-shaped shell and short neck inhabit islands with lush vegetation, like Santa Cruz Island.
Other islands, such as San Cristóbal and Hood, which are drier, have species with saddle-shaped shells and long necks.
Tortoises are predominately vegetarian, eating foliage, flowers, and fruits for their diet. When there is no freshwater, they obtain moisture from juicy cactus stems, grass, and other plants. When water is available, tortoises consume large quantities to store in their bodies.
The giant tortoises of the Galapagos Islands are among the longest-lived vertebrates, surviving more than 100 years in the wild.
Tortoises with a dome-shaped shell and short neck inhabit islands with lush vegetation, like Santa Cruz Island.
Other islands, such as San Cristóbal and Hood, which are drier, have species with saddle-shaped shells and long necks.
Tortoises are predominately vegetarian, eating foliage, flowers, and fruits for their diet. When there is no freshwater, they obtain moisture from juicy cactus stems, grass, and other plants. When water is available, tortoises consume large quantities to store in their bodies.
The giant tortoises of the Galapagos Islands are among the longest-lived vertebrates, surviving more than 100 years in the wild.