dusky tetraka

{{short description|Species of bird}}

{{speciesbox

| status = DD

| status_ref = {{cite iucn |author=BirdLife International |date=2020 |title=Crossleyia tenebrosa |volume=2020 |page=e.T22713021A177366079 |doi=10.2305/IUCN.UK.2020-3.RLTS.T22713021A177366079.en |access-date=17 November 2021}}

| status_system = IUCN3.1

| genus = Crossleyia

| species = tenebrosa

| authority = (Stresemann, 1925)

| synonyms = Phyllastrephus tenebrosus (Stresemann, 1925)

}}

The dusky tetraka (Crossleyia tenebrosa) is a species of Old World warbler in the family Bernieridae. It is found only in Madagascar. Its natural habitat is subtropical or tropical moist lowland forests. It is threatened by habitat loss.

In 2023, three individuals were discovered in northern Madagascar after it was assumed that the species had gone extinct due to threats to its habitat. Before then it was last seen in 1999. It is one of the ten most endangered bird species in the world.{{cite web |last1=Wilson |first1=Clare |title=Rare bird not seen for 24 years found alive in Madagascan forests |url=https://www.newscientist.com/article/2362126-rare-bird-not-seen-for-24-years-found-alive-in-madagascan-forests/ |website=New Scientist |publisher=Daily Mail and General Trust |access-date=2 March 2023 |archive-url=https://web.archive.org/web/20230302034353/https://www.newscientist.com/article/2362126-rare-bird-not-seen-for-24-years-found-alive-in-madagascan-forests/ |archive-date=2 March 2023 |location=London |language=English |date=1 March 2023}}

The dusky tetraka was formerly placed in the genus Xanthomixis. It was moved to the genus Crossleyia based on a molecular genetic study published online in 2019.{{Cite bioRxiv | last1=Younger | first1=J. | last2=Block | first2=N. | last3=Raherilalao | first3=M.J. | last4=Maddox | first4=J.D. | last5=Wacker | first5=K. | last6=Kyriazis | first6=C. | last7=Goodman | first7=S. | last8=Reddy | first8=S. | date=31 October 2019 | title=Diversification of a cryptic radiation, a closer look at Madagascar's recently recognized bird family | biorxiv=10.1101/825687 }}{{cite web| editor1-last=Gill | editor1-first=Frank | editor1-link=Frank Gill (ornithologist) | editor2-last=Donsker | editor2-first=David | editor3-last=Rasmussen | editor3-first=Pamela | editor3-link=Pamela C. Rasmussen | date=August 2024 | title=Grassbirds, Donacobius, tetrakas, cisticolas, allies | work=IOC World Bird List Version 14.2 | url=https://www.worldbirdnames.org/bow/grassbirds/ | publisher=International Ornithologists' Union | access-date=11 November 2024}}{{ cite web | last1=Clements | first1=J.F.| author1-link=James Clements (ornithologist) | last2=Rasmussen | first2=P.C. | author2-link=Pamela C. Rasmussen | last3=Schulenberg | first3=T.S. | last4=Iliff | first4=M.J. | last5=Fredericks | first5=T.A. | last6=Gerbracht | first6=J.A. | last7=Lepage | first7=D. | last8=Spencer | first8=A. | last9=Billerman | first9=S.M. | last10=Sullivan | first10=B.L. | last11=Smith | first11=M. | last12=Wood | first12=C.L. | year=2024 | title=The eBird/Clements checklist of birds of the world: Updates and Corrections—October 2024 | url=https://www.birds.cornell.edu/clementschecklist/updates-and-corrections-october-2024/#future-updates | access-date=10 November 2024 }}