In a recent Ecology and Evolution paper, biologists at the University of Texas at Austin describe the odd jay in more detail, explaining how the blue and green jays’ ranges might have crossed for this hybrid bird to exist. According to their analysis, green jays—a tropical bird found in Central America—have been migrating farther north as a result of temperature changes. Eventually, their paths crossed with blue jays, a temperate species common in the Eastern U.S. that had shifted their range west.
“We think it’s the first observed vertebrate that’s hybridized as a result of two species both expanding their ranges due, at least in part, to climate change,” Brian Stokes, study lead author and a postdoctoral student at The University of Texas at Austin, said in a statement.
From the article: