The hybrid "grue jay" was a result of mating between a male blue jay and a female green jay. Upon studying the bird’s genetics and appearance, the researchers concluded it was a male hybrid offspring of a green jay mother and a blue jay father. Data from eBird showing green jay and blue jay occurrences in Texas reported between 2000 to 2023. Temperatures are rising, causing the green jay to push further north. Meanwhile, the blue jay is extending its range westward, causing the two species to converge in a region near San Antonio.