A new scientific publication has placed the spotlight on two newly documented Maltese bird landraces: the Opal Spanish Sparrow and the Agate Spanish Sparrow.
The study, titled Additions to the Maltese Landrace Bird Breeds (Passeridae & Fringillidae), was authored by Arnold Sciberras, Jeffrey Sciberras and Roderick Abela and published in 2026 on Academia.eu.
At the heart of the work are two captive forms of the Spanish Sparrow that were developed through selective breeding in Malta. The authors describe them as genetically stable, heritable and recognisable lineages, making them part of Malta’s wider avicultural heritage.
The first is the Opal Spanish Sparrow, a pale, cool-toned form with silvery-grey and pearl-like plumage. According to the publication, this colour effect is linked to how pigment is distributed within the feathers, rather than to a complete loss of pigment.
The second is the Agate Spanish Sparrow, which has a warmer appearance. Its plumage is described through softer sand, cream and fawn tones, with gentler contrast than the wild-type Spanish Sparrow.
The publication explains that these forms were not simply one-off colour variations. They were developed and stabilised over successive generations through controlled breeding, with the Opal trait described as autosomal recessive and the Agate trait as sex-linked recessive.
The authors also stress that these are captive landraces, not wild Maltese populations. The study notes that the Spanish Sparrow is legally protected in Malta and that the founding birds used in the breeding programme came from foreign sources, with no local wild Maltese Spanish Sparrows incorporated into the programme.
This documentation is important because such lines can easily be lost if they are not properly recorded and maintained. The publication warns that neglect, misidentification or uncontrolled crossbreeding could erase distinctive local avicultural forms.
While the study also discusses the Maltese Caged Greenfinch and the Major Greenfinch for comparison, the main new contribution is the description of the Opal and Agate Spanish Sparrows as Maltese captive landraces.
For Malta’s aviculture community, this is more than a story about colour. It is about years of careful observation, breeding records, patience and local knowledge, the kind of quiet dedication that keeps a small but meaningful part of Maltese heritage alive.
Credit: Arnold Sciberras / Jeffrey Sciberras / Roderick Abela
