Moving east, Isabela Island is the largest in the archipelago. It was formed by five seperate volconoes that area still active. The most recent eruption being Wolf volcano in 2013. Isabela is large enough to separate the impact of the cold easterly currents from warmer currents. Hence the west side has cooler waters than the east and this results in a significant difference in marine life. To the west there are flightless cormorants, penguins, oceanic sun fish, red lipped bat fish and the endemic dorid nudibranch and Galápagos bull head shark.
And there are lots of turtles as well... the endangered green turtle is often seen while diving or snorkelling. The lucky visitor may also see a rare hawskbill.
Mockingbirds and finches remind us how Charles Darwin first had the idea of evolution by natural selection.