Santiago island Seymour norte island Conolophus subcristatus galapagos national park land iguanas island conservation

Threatened Galápagos Land Iguanas Return to Santiago Island En-Masse After 180-Year Absence

Reintroduction of Galápagos Land Iguanas helps restore Santiago Island’s ecological health and protect this important population.

Press Release, 8 January 2019

Contact: Sally Esposito, Island Conservation, Director of Marketing & Communications, +1 706-969-2783,
Resources: photos, interviews

The Directorate of Galápagos National Park (Dirección del Parque Nacional Galápagos – DPNG) and the international nonprofit organization Island Conservation reintroduced 1,436 Galápagos Land Iguanas (Conolophus subcristatus) to Santiago Island on the 4th January 2019. The partners are reintroducing the land iguanas in an effort to restore the island’s ecological health and to provide the opportunity for this iguana species to thrive.

Conolophus subcristatus galapagos national park land iguanas island conservation
The Land Iguanas (Conolophus subcristatus) were introduced to the coastal regions Puerto Nuevo and Bucanero of Santiago Island

The DNPG and Island Conservation captured the land iguanas in late 2018, and further captures are underway for additional releases. The DNPG and Massey University from New Zealand will begin monitoring the reintroduced iguana population in February.

Karl Campbell, Island Conservation’s South America Regional Director stated:

This is the largest iguana population ever translocated for a reintroduction and sees critical ecosystem processes like seed dispersal reinitiated for the first time in 180 years.”

More than 1,000 iguanas were relocated from the Galapagos’ North Seymour Island by the national park authority and Island Conservation staff

Land iguanas were sourced from North Seymour Island, where they were introduced in the 1930s and have increased to over 5000 and faced a lack of food availability.  DNPG’s Ecosystems Director, Danny Rueda, explained, “naturalist guides, DNPG technicians, and Island Conservation staff reported the increasing vegetation loss, particularly cacti, on North Seymour beginning in 2016. Cacti are the land iguana’s primary food source. Relocation of iguanas will protect the North Seymour population.”

After capture on North Seymour, land iguanas underwent 3-4 weeks of quarantine in captive holding facilities on Santa Cruz Island to ensure seeds in the iguana’s guts were not inadvertently transported between islands.

Galápagos Land Iguanas are listed as Vulnerable by the International Union for the Conservation of Nature. The reintroduced iguanas weigh in total over seven tons and are expected to thrive in their new habitat.

Conolophus subcristatus galapagos national park land iguanas island conservation
Some iguanas have remained on North Seymour Island to avoid compromising its existing vegetation

Charles Darwin was the second-last person to record land iguanas alive on Santiago Island in 1835, with Abel du Petit-Thouars being the last in 1838. Introduced feral pigs wiped out the land iguana population. When the California Academy of Sciences visited in 1903 they found only skeletal remains.

Santiago Island (58,465 ha / 144,470 acres) was freed of feral pigs in 2000, and feral goats and donkeys in 2005.

Santiago Island is the largest island worldwide to be freed of feral pigs, goats and donkeys, setting the stage for the next phase of island restoration activities like returning locally extinct species.

Other large scale restoration efforts are planned for other islands in the Galápagos. Funding contingent, in 2020 invasive predators will be eradicated from Floreana Island, protecting 55 endangered species and allowing for the reintroduction of 13 locally extinct species, including the Endangered Floreana Mockingbird and Floreana Giant Tortoise.

About Island Conservation

Island Conservation prevents extinctions by removing invasive species from islands. To date, we have successfully restored 64 islands worldwide, benefiting 1195 populations of 487 species and subspecies. Working together with local communities, government management agencies, and conservation organizations, we select islands that have the greatest potential for preventing the extinction of globally threatened species.

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