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Northern Mariana Islands

Yellow Bittern Ixorbrychus sinensis ©Laurence Poh Website

The Marianas is a chain of volcanic islands. [Politically Guam the largest and most southerly is a US territory - See Guam]. The rest of the chain running north (14 islands in all) is a US Commonwealth with it's own immigration and customs but using US currency, military, post office etc. Of the northern islands three are large enough to have towns and villages and two others have tiny populations (less than ten). The flora is tropical jungle. Year round temperatures are daytime highs of 88°F and overnight lows of 75°F. Rainfall is usually moderate but the islands are subject to tropical storms.

The islands of Saipan and Tinian were turned over to sugar production during Japanese colonial times (1899-1944) and most of the lowlands were converted to intensive agriculture. During the Second World War the islands were razed during the American invasion of June 1944 - extensive use was made of fire to clear possible cover used by the Japanese occupying forces. After the war aerial re-seeding was undertaken, but with non-native trees! That any birds survived at all is a tribute to their adaptability.

The brown tree snake, probably introduced via furniture imports from Indonesia, which has devastated native birds on Guam has been reported on Saipan but eradication efforts are under way and numbers, if any, are still small. Non-native bird species are doing some crowding out of the pretty little fantail [Rufous Fantail rhipidura rufifrons] on the island of Rota.

The islands these days are a major tourist destination for Japan and hotels and other tourist attractions abound. The ecology of Guam and Saipan have suffered accordingly. Two small islets attached to Saipan are noted for birds; the appropriately named Bird Island and Forbidden Island (so named because it was, for a long period, part of a CIA training area). The Island of Farallon de Mendinilla just north of Saipan is also noted for it's bird population but is not a good place to watch them because it is presently a US Naval bombing range.

Contributor

Nick Rolls

Saipan

nrolls@gtepacifica.net

Number of Species

Number of bird species: 103

Endemics

Number of endemics: 1

Rota White-eye Zosterops rotensis

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Trip Reports

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CloudBirders

Trip Report Repository

CloudBirders was created by a group of Belgian world birding enthusiasts and went live on 21st of March 2013. They provide a large and growing database of birding trip reports, complemented with extensive search, voting and statistical features.

2010 [01 January] - Jon Hornbuckle

Report

…took the inland road north to the war memorials, the main aim being to see a Micronesian Scrubfowl. No joy for some time before deciding to concentrate on the forest behind the Korean memorial…

2010 [06 June] - Petri Hottola

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…Among the main target species, Mariana Megapode is by far the most difficult one, but Nightingale Reed Warbler may also be tricky to spot when not actively singing, due to its skulking behaviour…

2012 [03 March] - Gail Mackiernan - Western Pacific Cruise (New Zealand to Japan)

Report

Mariana Fruit Dove Another brilliant dove. Fairly common, although not that easy to see. In all we saw about eight birds and heard others on Saipan – best views were along the Laderan Tangke Nature Trail…

Organisations

Marianas Wildlife Action Plan

PDF

The Northern Mariana Islands' Comprehensive Wildlife Conservation Strategy provides a strategic framework and an information resource to help conserve fish and wildlife and the lands and waters on which they depend for survival.

Other Links

Conservation of Micronesian Avifauna

Website

The Marianas Kingfisher was once a common sight perched on telephone lines, fluttering among trees, even dive-bombing chickens. Known locally as sihek, the Kingfisher is sometimes called Guam`s woodpecker because it hammers out a hole in tree trunks to nest. Tragically its numbers declined in the 60s and 70s due to the Brown Tree Snake, introduced on Guam by accident in the 1950s.

Mariana Common Moorhen

Website

Mariana Common Moorhen Gallinula chloropus guami Local name: Pulatta. The Mariana Island subspecies of the Common Moorhen resembles other moorhen subspecies found throughout the world. The Mariana Common Moorhen is a slate-black bird about 14 inches (35 centimeters) in length…

Mariana Swiftlet Aerodramus bartschi

Website

The Mariana swiftlet is endemic to the Northern Mariana Islands of Guam, Rota, Aguiguan, Tinian, and Saipan, but are currently found only on Guam, Aguiguan, and Saipan…

Nightingale Reed-warbler

Website

The Nightingale Reed-warbler is a very special bird of the CNMI. The Reed-warbler is endemic to the Mariana islands, meaning that our unique species Acrocephalus luscinia is only found in the Mariana Islands and nowhere else. There are other similar species found in Micronesia and Asia however they are not the same species.

The Effects of Nest Predation on the Forest Birds of the Mariana Islands

Website

Avian research in the Mariana Islands has been limited. Those studies that have addressed reproductive success have reported low nest success for some species. Predation by introduced rats is thought to be a contributing factor on the island of Saipan…