O.P. Pearson 1954 Anna hummingbird Sept 27 Orinda - 7:45 a.m PST. Two Anna hummingbirds squabbling over fresh outside bedroom window. Frequent vertical climbing by both birds close together, beating their wings against each other (flying slowly straight up, not spiralling, usually within a foot of each other), some squeaking. Looked like a territorial dispute except for the slow towering (sometimes 30 feet or more) and use of a single ported, 1/2-second long whistle (ever) that sounds like a soft version of the dive note. One bird was male, other assumed to be female at first but later appeared to be ♀. After numerous (6-10?) towerings and some tumblings together they fell to the grass and after brief fluttering remained quiet. ♀ lay on her back, wings outstretched, bill pointing up; ♂ with back up, lying slightly crooked under, wings outstretched, his tail lying on her primrose or possibly even holding them. I was watching through porch screen at 8 feet, camera at 18 feet with binoculars. Birds remained thus for 9 minutes, the ♀ not moving, the ♂ pulsating (wings & tail moving rhythmically) occasionally. When a sparrow appeared and hopped a few feet away they separated and resumed towerings. After about 3 towerings and a few tumbles (both onto the ground for several seconds) they tumbled to the ground for 3 more minutes, ♀ as before, ♂ directly on top of her with