An odd bird found in a Texas backyard is the offspring of two distantly related species, separated by 7 million years of evolution, whose ranges only recently began to overlap due to climate change , researchers report in a new study. The bird is descended from a blue jay ( Cyanocitta cristata ), which is native to the eastern and central United States, and a green jay ( Cyanocorax luxuosus ), which traditionally occurs in Central America, Mexico, and southern Texas. "We think it's the first