Isla Magüeyes is a 7.2 ha (0.0277993554186625 sq mi; 0.072 km²) island 50 metres (164 ft) from the southwest coast of the island of Puerto Rico

Puerto Rico

Puerto Rico , officially the Commonwealth of Puerto Rico , is an unincorporated territory of the United States, located in the northeastern Caribbean, east of the Dominican Republic and west of both the United States Virgin Islands and the British Virgin Islands.Puerto Rico comprises an...

. It is encircled with mangrove

Mangrove

Mangroves are various kinds of trees up to medium height and shrubs that grow in saline coastal sediment habitats in the tropics and subtropics – mainly between latitudes N and S...

 and has an interior of dry scrub habitat, where it gets its name. It is named for the presence of many century plant

Century plant

Agave americana, commonly known as the century plant, maguey, or American aloe , is an agave originally from Mexico but cultivated worldwide as an ornamental plant...

s or maguey (Agave americana). The surrounding shelf of the island is mostly coral reef

Coral reef

Coral reefs are underwater structures made from calcium carbonate secreted by corals. Coral reefs are colonies of tiny living animals found in marine waters that contain few nutrients. Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups. The polyps...

. There are buildings on the western end of the island associated with the Department of Marine Sciences, University of Puerto Rico at Mayagüez

University of Puerto Rico at Mayagüez

The University of Puerto Rico at Mayagüez or Recinto Universitario de Mayagüez in Spanish , is a land-grant, sea-grant, space-grant state university located in the city of Mayagüez, Puerto Rico...

. UPR- Mayagüez is the most important center in the Atlantic region for the study of tropical marine science due to its location, facilities, and first-rate researchers. The research facilities includes the Puerto Rico Water Resources and Environmental Research Institute, the Caribbean Coral Reef Institute (CCRI), the Research and Development Center, the Agricultural Research Station and the Caribbean Atmospheric Research Center (ATMOSCarib).

Fauna

A free-ranging colony of feral

Feral

A feral organism is one that has changed from being domesticated to being wild or untamed. In the case of plants it is a movement from cultivated to uncultivated or controlled to volunteer. The introduction of feral animals or plants to their non-native regions, like any introduced species, may...

 Cuban iguanas

Cyclura nubila

Cyclura nubila, also known as the Cuban rock iguana, Cuban ground iguana, or Cuban iguana, is a species of lizard of the iguana family. It is the largest of the West Indian rock iguanas , one of the most endangered groups of lizards...

, released from a zoo that was closed on the island in the 1950s inhabit all parts of the island as do rhesus monkeys which escaped from a University laboratory. While the iguanas are endangered in their native Cuba

Cuba

The Republic of Cuba is an island nation in the Caribbean. The nation of Cuba consists of the main island of Cuba, the Isla de la Juventud, and several archipelagos. Havana is the largest city in Cuba and the country's capital. Santiago de Cuba is the second largest city...

 and are currently protected by the US Endangered Species Act

Endangered Species Act

The Endangered Species Act of 1973 is one of the dozens of United States environmental laws passed in the 1970s. Signed into law by President Richard Nixon on December 28, 1973, it was designed to protect critically imperiled species from extinction as a "consequence of economic growth and...

, there has been talk of eliminating or reducing the population here as they are considered an invasive species

Invasive species

"Invasive species", or invasive exotics, is a nomenclature term and categorization phrase used for flora and fauna, and for specific restoration-preservation processes in native habitats, with several definitions....

. Currently dogs, cats, and most tourists are barred from the island to protect the iguanas. This has turned the island into somewhat of an unofficial bird sanctuary and brown pelican

Brown Pelican

The Brown Pelican is the smallest of the eight species of pelican, although it is a large bird in nearly every other regard. It is in length, weighs from and has a wingspan from .-Range and habits:...

s, cattle egret

Cattle Egret

The Cattle Egret is a cosmopolitan species of heron found in the tropics, subtropics and warm temperate zones. It is the only member of the monotypic genus Bubulcus, although some authorities regard its two subspecies as full species, the Western Cattle Egret and the Eastern Cattle Egret...

s, and heron

Heron

The herons are long-legged freshwater and coastal birds in the family Ardeidae. There are 64 recognised species in this family. Some are called "egrets" or "bitterns" instead of "heron"....

s are commonly observed here.

The iguana colony has been used as a research control group for various experiments concerning animal communication

Animal communication

Animal communication is any behavior on the part of one animal that has an effect on the current or future behaviour of another animal. The study of animal communication, is sometimes called Zoosemiotics has played an important part in the...

 and evolution

Evolution

Evolution is any change across successive generations in the heritable characteristics of biological populations. Evolutionary processes give rise to diversity at every level of biological organisation, including species, individual organisms and molecules such as DNA and proteins.Life on Earth...

.