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Wildlife & Habitat

Micronesian kingfisher

After World War II, the brown tree snake was accidentally introduced into Guam. With no natural predators and abundant prey, the snake population steadily grew and spread throughout the island. As the snakes dispersed, forest bird and fruit bat populations plummeted. By the late 1980s, 12 species of birds and the little Mariana fruit bat had disappeared from Guam. The Refuge provides habitat for the last remaining populations of the endangered Mariana fruit bat, Mariana crow, and the Serianthes nelsonii tree. The brown tree snake is considered the primary cause for the decline of native Guam bird species.

  • Birds

    Mariana Crow

    The Mariana Crow is a small black crow with a slight greenish-black gloss on its head, back, underparts, and wings. Its tail has a bluish-black gloss. Females are smaller than the males.

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  • Mammals

    Mariana Bat

    The "fanihi" is a medium-sized bat measuring 195 to 250 mm from head to rump, with a wingspan of 860 to 1065 mm. The males are slightly larger than the females. The abdomen and wings are dark brown to black with individual gray hairs intermixed throughout the fur. The mantle and sides of the neck are bright gold on most animals but in some individuals, this region may be pale gold or pale brown. The color of the head varies from brown to dark brown.

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  • Reptiles

    Green turtle

    Haggan, or green sea turtles, are a threatened species of sea turtle characterized by a smooth carapace with four pairs of lateral scutes and a coarsely serrated lower jaw-edge. The Hawksbill sea turtle is an endangered species, named for its narrow head and sharp, bird-like beak that can reach into cracks and crevices of coral reefs when foraging.

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  • Habitat

    Serianthes leaf

    Serianthes nelsonii, or "Hayun lagu", is one of the largest native trees in the Mariana Islands. An endemic tree found only on the islands of Guam and Rota, Serianthes nelsonii is an endangered species with only one adult tree known living on Guam. To protect Hayun lagu, it was listed as an endangered species in 1987.    

Last Updated: Mar 09, 2016
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