According to an article in last week’s Proceedings of the National Academy of Sciences, researchers have discovered five species (Yellow-billed Cuckoo, Orchard Oriole, Hooded Oriole, Yellow-breasted Chat, and Cassin’s Vireo) of migratory songbirds that breed once in the Western United States, then again in Mexico. A good article summarizing the research can be found at the Birder’s World Field of View blog. Pretty cool, even though the cuckoo is really the only bird we see often here in South Florida!

I wonder what else goes on with these birds when we’re not looking?