Radio-monitoring as a method for estimating time budgets of GuillemotsUria aalge

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Abstract
In 1983-84, 14 radio transmitters were attached to Guillemots on the Isle of May [UK]. Those with internal tuned loop transmitting aerials, glued in the centre of the bird''s back with a small amount of resin were most satisfactory. Most birds retained their transmitters for 10-20 days. The bird''s behaviour was sometimes altered and ways of minimizing this are discussed. Except when they had young, three (apparently normal) breeding Guillemots spent very little time on the sea in front of their site. The maximum foraging range was smallest at this time.

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