Abstract
1. 1. The use of precision automated electronic balances for determining short-term mass changes in birds is described. The physiological nature of mass changes was investigated in laboratory conditions with canaries and sand martins. Balances were also placed underneath the nests of free-living swallows. 2. 2. Accurate monitoring of short-term mass changes allowed longer-term (i.e. daily) mass changes to be predicted in a canary. 3. 3. Continuous mass losses varied according to the activity of birds studied. 4. 4. In wild swallows, parental mass losses during incubation bouts, mass changes of foraging adults, food load masses and faecal masses were recorded to a degree of precision not previously attained.
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