EGG SIZE AND THE EGG PREDATORY BEHAVIOUR OF CROWS by WILLIAM A. MONTEVECCHI 1) 2) (Institute of Animal Behavior, Rutgers University, Newark, N. J., U.S.A.) (With 2 Figures) (Acc. 25-IV-1975) INTRODLTCTION A number of studies have demonstrate<i the protective advantages of the cryptic colouration and marking patterns of prey items subjected to crow predation (TURNER, ig6i; TINBERGEN et al., 1962; CROZE, 1970). TINBERGEN, IMPEKOVEN & FHAi,ccK (1967), CROZE (1970), and G6RANS.,,ON et al. (1975) have further shown that the spatial distribution of cryptic influences corvid predation success. Observations made during previous experiments on eggshell camouflage and egg predation by crows (MONTEVECCIII, 1976) suggested that egg size may influence the manner in which crows prey on eggs. The present experiments systematically investigated the predatory patterns of corvids and the effects of prey (egg) size on their behaviour and predation success. 1. CORVUS BRACHYRHYNCHOS PREDATION ON LARGE, MEDIUM AND SMALL EGGS Previous observations suggested that crows would fly off with eggs whenever they could easily pick them up in their mandibles. The crows usually flew with the eggs from the site of predation to a location fifteen to one thousand meters distant where the eggs were usually hidden under grass
Behaviour – Brill
Published: Jan 1, 1976
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