author(s)
Nail M Hasan

abstract
Birds have adapted to arid environments by evolving suitable behaviour to cope with these environments. Outbursts of sudden rain in an arid environment can dramatically affect relative humidity. The effect of changes in relative humidity on start of dawn chorus is studied in two common resident passerine birds, bulbuls and sparrows. The study shows that start of dawn chorus has no significant correlation with relative humidity. The only significant correlation (0.026) was found in the month of January for sparrows. There was no significant correlation for bulbuls in period of study.