Watching the peregrines incubate we often see that they turn the eggs. Why? For decades all kind of suggestions where made, but we now know that it has everything to do with albumen. Th eprimary function of eggturning appears to be to maximise the efficiency of the process of albumen utilisation by the embryo. When incubation starts eggs have to be turned very often. The incubationtime is short and the temperature is high in order to hatch soon. The development is very fast and therefore should be optimal. Reptile embryo's for instance take a much longer time to grow. Of major importance is the growth of the extra embryonic membranes and by turning the eggs the growth will be maximal. Turning also ensures a maximal formation of the sub-embryonic fluid.More about this subject on my website.
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