Nestlings begin making a soft "cheep" at about a week of age.
The call is a series of quiet cheeps which become faster and higher-pitched.
When disturbed, the whole flock will disperse, cheeping, and re-congregate near-by.
Its basic call is a "cheep" or "chilp", similar to that of other sparrows.
Newly hatched chicks make a soft "wheeeez" call, and older chicks cheep.
Chicks initially cheep weakly, but soon develop a "tyk-tyk-trik" begging call.
We have not heard a cheep from them about the immobility of labour caused by the fact that people cannot move easily from the north to the south.
It seems to me reasonable that those who pay the piper should be reasonably certain of having a chance of cheeping a little of the tune when the time comes.
