The Galápagos Islands Show Evolution Across Land and Sea

Explore how volcanic islands, ocean currents, and isolation shaped Galápagos wildlife, from giant tortoises to marine iguanas and blue-footed boobies.

In the Galápagos, a lizard can feed in the sea and then rest on sun-warmed rock. Marine iguanas are one example of how unusual ways of life developed across these volcanic islands.

The wildlife is remarkable, but the setting explains much of the surprise.

Islands built by volcanoes

The Galápagos archipelago belongs to Ecuador and lies in the eastern Pacific. Volcanic activity built islands that differ in age, shape, and habitat.

UNESCO describes the interaction of isolation, geology, and ocean conditions that helped shape their living communities.

The islands are not one identical habitat repeated across the sea. Their differences create opportunities for different species and populations.

Marine iguana resting on a coastal rock in the Galápagos Islands — A marine iguana resting on the Galápagos coast. Photo: Diego Delso / Wikimedia Commons; CC BY-SA 4.0.

Animals connect land and water

Marine iguanas feed on marine algae and return to land. Seabirds such as blue-footed boobies also depend on ocean food while using land for breeding.

Giant tortoises belong to another part of the story, feeding and moving through terrestrial habitats.

Together, these animals show why conservation cannot stop at the shoreline. The sea supplies resources that support much of the life visible on the islands.

Evolution is a continuing process

Charles Darwin visited in 1835, and Galápagos observations helped inform his later thinking. The scientific importance of the islands did not end with that visit.

The Charles Darwin Foundation's 2026 Galápagos Atlas brings together modern knowledge of species, geology, climate, and ecosystems.

Evolution is not a special event that happened once here. Changing conditions continue to influence which organisms survive and reproduce.

Blue footed booby — Couple of Blue-footed boobies (Sula nebouxii) during a mating ritual, Lobos Island, Galápagos Islands, Ecuador. The blue-footed bo — Blue footed booby photographed in its surroundings. Photo: Diego Delso / Wikimedia Commons; CC BY-SA 4.0.

Protect relationships, not only famous animals

Introduced species, habitat pressures, and changing ocean conditions can affect island ecosystems. Protecting wildlife involves biosecurity and care for connected habitats.

The Galápagos invite us to see beyond a checklist of unusual creatures. Each tortoise, iguana, and seabird belongs to a network shaped by isolation—but sustained by connections between rock, water, plants, and other life.

Photo credits

Featured image: U.S. Fish and Wildlife Service; Wikimedia Commons source; Public domain. Resized for web display.

Body image 1: Diego Delso; Wikimedia Commons source; CC BY-SA 4.0. Resized for web display.

Body image 2: Diego Delso; Wikimedia Commons source; CC BY-SA 4.0. Resized for web display.