species of native bats, including the Samoa flying fox and insular flying fox. The avifauna includes 65 species of bird where the more unusual distinctive ones are the blue-crowned lorikeet, the spotless crake, the many-colored fruit dove, the wattled honeyeater, tropical pigeons, the samoan starling, white tern, black noddy and the red-tailed tropicbird. There are many reptiles in the islands, including five species of geckos, eight species of skinks and two species of snakes: the Pacific boa and the Australoasian blindsnake. The marine life is magnificent and much concentrated around the colorful coral reefs. The Samoan ocean is a home to sea turtles as hawksbill sea turtle, olive ridley sea turtle, leatherback sea turtle and the green sea turtle. Five species of dolphins live in the area: spinner dolphin, rough-toothed dolphin, bottlenose dolphin, pantropical spotted dolphin and striped dolphin. Guam Shortly after World War II, the brown tree snake was introduced to the island of Guam and caused much of the endemic wildlife to become extinct. Due to an abundance of prey species and lack of predators, the brown tree snake's population exploded and reached nearly 13,000 snakes per square mile at most. Ten out of twelve endemic bird species, ten lizards and two bats all became extinct as a result of the introduction of the brown tree snake. In recent years, a lot has been done by the U.S. government to decrease the number of brown tree snakes on the island. For instance in 2013, a $1 million program by the U.S. Fish and Wildlife Service dropped more than 2000 mice filled with poison on the island. In 2013, more than two million brown tree snakes were estimated to be on the island. Other introduced species include the Philippine deer, the Asiatic water buffalo, the marine toad and the giant African land snail. Several native species of skinks, geckos and a monitor lizard are still found on the island. Northern Mariana Islands The Commonwealth of Northern Mariana Islands is home to 40 indigenous and introduced bird species. Some endemic bird species are the Mariana fruit dove, the Mariana swiftlet, the Rota white-eye, the Tinian monarch, the bridled white-eye and the golden white-eye. Other common, but introduced species, include the collared kingfisher, the rufous fantail, the fairy tern and the uniform swiftlet. The Mariana fruit bat is endemic to both Guam and the Northern Mariana Islands. The sambar deer is