Paris gambelli June 9 P.M. W. Benton, Bridge Glens Mt., 8500 ft., Mono Co., Calif. Found a nest in a crevice on old stump. One bird was on nest, the other was in a nearby tree with food. The one in the nest put on quite a display. It puffed itself up, and lunged toward the opening repeatedly giving a hiss each time it lunged. The branch was open from the top as well as the side, so I could see it very plainly. This hissing has been described, both for young + adult birds of this family. I don't know that the actions have been described. The wings were extended as much as possible in the narrow hole, the head drawn back, + the neck fluffed out. The lunges moved the whole body forward, extending the head. A rapid eye blinding accompanied this. The lunges + hisses were very rapid, perhaps 5 a second. The bill was closed all the time. The nest is made of some fluffy gray material which raises a dust with each lunge. I poked in a stick which she struck at. Finally I moved away & she left nest. The nest contained at least 1, I could not see more young no feathers but sheaths well out. They continued to bring food as I wrote this, 0845. Wild wind today, no sun. A pair of Bush-tits joined the bird in the tree in protesting my presence.