Rare Hybridization of Blue Jay and Green Jay Documented in Texas
Researchers at the University of Texas have identified a rare hybrid bird resulting from the mating of a blue jay and a green jay, attributed to climate-induced range expansions.
A rare hybrid bird, resulting from the mating of a blue jay and a green jay, has been identified in the suburbs of San Antonio, Texas. This discovery, detailed in the journal Ecology and Evolution, is attributed to climate-induced range expansions of both species.
In 2023, a local resident observed an unusual bird and shared its image on social media. Brian R. Stokes, a PhD candidate at the University of Texas's Department of Integrative Biology, noted the bird's distinctive neck and facial markings, which resembled those of a green jay, despite its blue coloration. Upon capturing the bird and conducting genetic analyses, researchers confirmed it as a hybrid, with nuclear DNA evenly split between blue jay and green jay ancestry, and mitochondrial DNA indicating a green jay mother.
Stokes explained that climate change has facilitated the northward expansion of green jays by up to 200 miles from their traditional range near the Texas-Mexico border. Similarly, blue jays have expanded westward, influenced by both climate factors and urbanization. These range shifts have led to overlapping habitats and, consequently, interbreeding opportunities.
The hybrid, a male estimated to be about four years old, was last observed in June 2025. While this is the first documented case of such hybridization, Stokes noted the possibility of more hybrids in the future as species continue to adapt to changing environments.