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Java sparrow

life science Maturity 9-11 Next article →

The Java sparrow is a small passerine bird known for its striking appearance.

Padda oryzivora -University of Hawaii at Manoa campus, Honolulu, Hawaii, USA-8
Padda oryzivora -University of Hawaii at Manoa campus, Honolulu, Hawaii, USA-8

It belongs to the family Estrildidae. This species is a resident breeding bird in several Indonesian locations, including Java, Bali, and Bawean. Because these birds feed mainly on grain and other seeds, they have often been viewed as agricultural pests. This is especially true in rice fields, which influenced their scientific name. Today, the bird is a popular subject in aviculture, or the practice of keeping birds in captivity.

An adult Java sparrow has a very specific look that makes it easy to identify. They possess grey upperparts and a grey breast, which contrasts with a bright pink belly. Their heads are black with white cheeks, and they feature a distinctive red eye-ring. Their thick bills and feet are also red.

Padda oryzivora -University of Hawaii at Manoa campus, Honolulu, Hawaii, USA-8
Padda oryzivora -University of Hawaii at Manoa campus, Honolulu, Hawaii, USA-8

Both males and females look similar in adulthood. Immature birds look quite different, with brown upperparts and pale brown underparts. Very young birds even have a black beak with a pink base.

Padda oryzivora -University of Hawaii at Manoa campus, Honolulu, Hawaii, USA -juvenile-8-4c
Padda oryzivora -University of Hawaii at Manoa campus, Honolulu, Hawaii, USA -juvenile-8-4c

These birds use complex sounds to communicate with one another. A study by Furutani et al. in 2018 showed that they produce different trill-calls based on their social situation. This is a form of social communication that helps them convey specific intentions. For example, when birds are in aggressive interactions, they emit faster trill-calls. These aggressive calls also have higher sound pressure levels and higher entropy. In contrast, during affiliative behaviour, which refers to friendly social interactions, the trill-calls are slower and softer.

Scientific classification for the Java sparrow has changed as researchers learned more about its genetics. The Swedish naturalist Carl Linnaeus formally described the species in 1758. He published his description in the tenth edition of his work, *Systema Naturae*. He used the binomial name *Loxia oryzivora*. The name combines the Latin word *oryza*, meaning "rice," with *-vorus*, meaning "eating." Linnaeus based his work on descriptions by George Edwards from 1743. For a long time, the species was classified in the genus *Padda*. In 2009, preliminary genetic studies moved them to the genus *Lonchura*. However, more detailed genetic analysis in 2020 returned them to their older status in *Padda*.

Humans have kept Java sparrows as cage birds for many centuries. In China, they were popular during the Ming Dynasty. In Japan, they have been kept since the 17th century and appear in many traditional paintings.

Yatomi Japanese Rice Bird ac
Yatomi Japanese Rice Bird ac

In the United States, they were very popular during the late 1960s and early 1970s. However, their import was eventually banned. In California, it remains illegal to possess them due to a perceived threat to agriculture. In Asia, breeders often raise them from birth, which helps the birds become very tame and attached to humans.

Yatomi Japanese Rice Bird ac
Yatomi Japanese Rice Bird ac

In captivity, humans have bred the birds to show a wide variety of colors. These include white, silver or opal, fawn or isabel, pastel, cream, and agate. The agate color is currently rare in European captive specimens. In Japan, a pied version of the bird is known as the sakura buncho.

Yatomi Japanese Rice Bird ac
Yatomi Japanese Rice Bird ac

The species has also been introduced to many other places. They have breeding populations on several Hawaiian Islands, particularly Oahu. They are also common near San Juan in Puerto Rico. Other sightings have occurred on Christmas Island and in Jamaica.

Despite their popularity, the Java sparrow faces serious threats in the wild. They are currently evaluated as endangered on the IUCN Red List of Threatened Species. This means there are likely fewer than 10,000 individuals remaining in the wild. The birds face a loss of natural habitat, hunting, and trapping by people who view them as pests. They are also threatened by the illegal exotic pet trade because people want their distinctive songs. To help protect them, the species is listed on Appendix II of CITES, an international agreement to protect wildlife.

Padda oryzivora -University of Hawaii at Manoa campus, Honolulu, Hawaii, USA-8
Padda oryzivora -University of Hawaii at Manoa campus, Honolulu, Hawaii, USA-8
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File:Padda oryzivora -University of Hawaii at Manoa campus, Honolulu, Hawaii, USA -juvenile-8-4c.jpg
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