Isabela Island is the largest island in the Galapagos, but has only 1800 human residents.  We landed at the small town of Puerto Villamil before hiking to the Sierra Negra Volcano. 
This sea lion looks disappointed that he can't smoke on the island.....
The Sierra Negra volcano, with the largest basaltic caldera in the Galapagos. 
The volcano last erupted in 2018.
Birds we encountered on our walk included  beautiful Vermillion Flycatchers, endemic to the Galapagos, a Galapagos mockingbird, also endemic, and a yellow warbler.
Lava lizards everywhere!
And a marine iguana
After lunch, we took a bus up to the Giant Tortoise Breeding Centre, who have been working since the 1950s to re-establish the near-extinct giant tortoise species.  
Near the Tortoise Breeding Centre are wetlands where we saw pink flamingos 
And an impressive-looking marine iguana
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