At El Potrero, I hear a call so unfamiliar to me that I don’t even have an idea what family of birds to think singer fits into. It’s loud, yet grasshopper like and chattering and then I see it–a kingbird and not just any kingbird, but a Tropical Kingbird. The thing displays and displays until I’m sure of what I’m looking at and then flies into a large mesquite shading my winter quarters there and promptly a Western Kingbird comes screaming through the air and dive-bombs the exotic visitor, chases it off, and there’s no time to pursue. Is it in post-breeding dispersal wanderlust, as it and many of its relatives take up? or has it been there all Summer, outside my awareness?