At long last, hummingbirds are showing up at my feeder and windowbox planter (they like 
the Lantana). There are at least two individuals, both either females or juveniles. At least 
one of them vocalizes constantly while hovering around or sitting on the feeder, a rapid 
"Squeak, squeak" sound. (It's actually useful - I know to look out my window when I hear 
the squeaking...)

I haven't yet been able to distinguish who the dominant is. Yesterday, one was perched on a 
nearby branch, when a second hummer came in to the feeder. The second bird hovered by 
the feeder a bit, then went and hovered in front of the perched bird and squeaked. The 
perched bird then dove after the squeaker and chased her out of the yard.

Anyone else notice this kind of behavior?

Mary LaMarca
Silver Spring, MD