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2. An analysis of the predatory behavior of the loggerhead shrike;Cralc;Auk,1978
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4. The foraging efficiency of great tits (Parus major) in relation to light intensity;Kacelnik;Anim. Hehav.,1979a
5. Kacelnik , A. 1979b Studies of foraging behaviour and time-budgeting in great tits ( Parus major ) Unpubl. D.Phil. thesis