Egg dimensions of the Roller Coracias garrulus in farming areas of the Southwest Iberian Peninsula

Avilés J.M., Sánchez J.M. and Sánchez A.



Abstract:

Egg dimensions of the Roller Coracias garrulus in farming areas of Extremadura were studied in 1989 and 1990. Egg dimensions of Rollers tend to be smaller in the south compared to the north. Differences in egg dimensions were not found in the studied population in relation to years. Climatic conditions during the laying period did not influence egg size. No seasonal decline in egg size was detected and, similarly, we did not detect a clear trade-off between egg size and clutch size.