1957 22 July Calyptra anura those the breeding season, at least occasionally. The most interesting part of this week's observations however is the clarification regarding the deep note. It evidently is given by 1st year males and well into the first winter (Dec-Jan, possibly later yet; see notes of previous years). It is aggressive, and used under circumstances of low-level activity when there is only occasional stimulus for full song. Sometimes after the first winter, this note is dropped. This would explain its use by some males & not others. 8/2 was not heard singing during the week until the morning of the 22nd. Then its song was like that of an adult, but still recognizably more grating or gravelly and more wiry, perhaps just slightly higher pitched than that of the adult. Also the pattern was monotonous, like that of the young male, without the strong