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Biology

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Unusually for weaver birds, species of Foudia are often monogamous. The Mauritius fody generally holds territories of over one hectare exclusively with just one mate (4), although some male Mauritius fodies have been observed with more than one female (3). Breeding between late June and early April (3) (4), both sexes help to build the nest, which is then lined by the female only. Between two and four eggs are laid and incubated by the female, with the male helping to feed the chicks after hatching for two weeks, before they fledge and leave the nest to disperse. At the end of the breeding season, the adults undergo a complete moult. Pairs defend the territory all year, and do not make seasonal migrations (4). The diet of the Mauritius fody is comprised primarily of invertebrates, but nectar, fruit, seeds and the eggs of birds and geckos are also consumed (5). Some females have even been seen feeding on the eggs of other Mauritius fodies (3).
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Conservation

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At present, it would be impossible to eliminate all rats and macaques from the whole of Mauritius, and therefore conservation efforts have focussed on establishing populations on offshore, predator-free islands (3). The release of captive-bred individuals onto the predator–free island of Ile aux Aigrettes in 2003 has proved successful, with the population, which is provided with supplementary food, increasing to 151 individuals by July 2008 (3). Other conservation measures in place to help protect the Mauritius fody include restoring native forests and establishing plantations of non-invasive, exotic trees such as Japanese red cedar (Cryptomeria japonica) which mammalian predators appear to avoid (7).
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Description

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Breeding males of this medium-sized forest weaver bird are highly distinctive, with a bright red head, neck and breast, and dark olive-brown back, wings and tail streaked with pale brown (2) (3). The rump is also reddish (2), and two white bars pattern the wings (3). In the non-breeding season, males lose their vivid red colouration and resemble females. The slightly hooked beak of males is black, while that of females and juveniles is horn-coloured (3).
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Habitat

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Inhabits all types of forest, even degraded forest invaded by introduced plant species (2). On the mainland, the highest densities of this bird are found in small plantations of exotic trees surrounded by degraded native forest. On Ile aux Aigrettes, the Mauritius fody inhabits lowland ebony forest and coastal scrub (3).
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Range

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The Mauritius fody has suffered a constant and severe decline in range and numbers since 1975, and is now found only in southwest Mauritius (2), and on the small, offshore island of Ile aux Aigrettes, where captive-bred fodies were released in 2003 (3).
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Status

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The Mauritius fody is classified as Endangered (EN) on the IUCN Red List (1).
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Threats

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Although threatened by the clearance of upland forest, the Mauritius fody has also been suddenly lost from areas of intact habitat (2). It is thought that these regions have been affected by particularly high levels of egg predation by both the black rat (Rattus rattus) and the crab-eating macaque (Macaca fascicularis) (6).
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Mauritius fody

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The Mauritius fody (Foudia rubra) is a rare species of bird in the weaver family. It is endemic to the island of Mauritius. It is classified by BirdLife International as being endangered.[2] It is also on the United States' Endangered Species List with an endangered status.[3]

This bird is 14 centimeters long. Breeding males are olive brown with a red head, breast and rump patch and black lores.[2] While females, non-breeding males and juveniles are olive brown with white wing bars and a brown bill.

The bird lives in several types of forest, including degraded areas, as well as plantations. Stands of Japanese cedar (Cryptomeria japonica) have replaced native vegetation and now provide protection against predators.[4] It feeds on insects like grasshoppers, beetle larvae, caterpillars, and also spiders. Berries are eaten regularly by some individuals. It feeds on nectar regularly, using its specialised brush-tipped tongue.[5]

The bird is a weaver, the male and female cooperating to weave each nest, from material like grass, moss and small twigs.[4]

The Mauritius fody is threatened by the loss of its habitat and predation from introduced predators. Beginning in the 1970s much of its habitat was lost when the land was cleared for plantations.[2] By 2001 there were perhaps no more than about 100 breeding pairs.[6] Nests are raided by predators, especially the black rat (Rattus rattus) and the crab-eating macaque (Macaca fascicularis). This is currently the main cause of the bird's decline. Some areas of intact habitat have high nest predation, but areas of low nest predation may be poor habitat.[2] The common myna has also been observed preying on nests. Nest failure may occur when it is infested with tropical nest fly. The larvae of the fly attack the chicks, latching on and feeding on their blood, causing dehydration and anemia in the chicks.[4]

Conservation efforts include the control of rats and macaques. A captive breeding program carried out by the Mauritan Wildlife Foundation has produced many chicks.[2] Eggs are removed from nests in the wild and hatched in captivity as the wild pairs produce and rear another clutch simultaneously.[6] Nests are treated for tropical nest fly. Supplemental food and water are given.[4] The population has increased recently due to conservation programs establishing sub-populations on offshore islands.[2] Due to these conservation efforts the species was downlisted from critically endangered to endangered in 2009.

Île aux Aigrettes, an islet off the main island of Mauritius, is now home to a number of Mauritius fodies and other threatened species that have been translocated there.[4]

References

  1. ^ BirdLife International (2016). "Foudia rubra". IUCN Red List of Threatened Species. 2016: e.T22719149A94614044. doi:10.2305/IUCN.UK.2016-3.RLTS.T22719149A94614044.en. Retrieved 12 November 2021.
  2. ^ a b c d e f BirdLife International Species Fact Sheet
  3. ^ USFWS. Addition of 30 African birds to list of endangered and threatened wildlife. Federal Register January 12, 1995.
  4. ^ a b c d e Garrett, L. (2009). Mauritian Wildlife Foundation Mauritius Fody Recovery Programme Annual Report 2008-09. Archived 2012-05-27 at the Wayback Machine
  5. ^ Mauritius fody on Weaver Watch
  6. ^ a b Mauritius Fody. Durrell Wildlife Conservation Trust. September 12, 2011.

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Mauritius fody: Brief Summary

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The Mauritius fody (Foudia rubra) is a rare species of bird in the weaver family. It is endemic to the island of Mauritius. It is classified by BirdLife International as being endangered. It is also on the United States' Endangered Species List with an endangered status.

This bird is 14 centimeters long. Breeding males are olive brown with a red head, breast and rump patch and black lores. While females, non-breeding males and juveniles are olive brown with white wing bars and a brown bill.

The bird lives in several types of forest, including degraded areas, as well as plantations. Stands of Japanese cedar (Cryptomeria japonica) have replaced native vegetation and now provide protection against predators. It feeds on insects like grasshoppers, beetle larvae, caterpillars, and also spiders. Berries are eaten regularly by some individuals. It feeds on nectar regularly, using its specialised brush-tipped tongue.

The bird is a weaver, the male and female cooperating to weave each nest, from material like grass, moss and small twigs.

The Mauritius fody is threatened by the loss of its habitat and predation from introduced predators. Beginning in the 1970s much of its habitat was lost when the land was cleared for plantations. By 2001 there were perhaps no more than about 100 breeding pairs. Nests are raided by predators, especially the black rat (Rattus rattus) and the crab-eating macaque (Macaca fascicularis). This is currently the main cause of the bird's decline. Some areas of intact habitat have high nest predation, but areas of low nest predation may be poor habitat. The common myna has also been observed preying on nests. Nest failure may occur when it is infested with tropical nest fly. The larvae of the fly attack the chicks, latching on and feeding on their blood, causing dehydration and anemia in the chicks.

Conservation efforts include the control of rats and macaques. A captive breeding program carried out by the Mauritan Wildlife Foundation has produced many chicks. Eggs are removed from nests in the wild and hatched in captivity as the wild pairs produce and rear another clutch simultaneously. Nests are treated for tropical nest fly. Supplemental food and water are given. The population has increased recently due to conservation programs establishing sub-populations on offshore islands. Due to these conservation efforts the species was downlisted from critically endangered to endangered in 2009.

Île aux Aigrettes, an islet off the main island of Mauritius, is now home to a number of Mauritius fodies and other threatened species that have been translocated there.

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