Common cuckoo lay eggs that better imitate the host's eggs, the host species adapts and is more able to distinguish the cuckoo egg. A study of 248 common cuckoo and host eggs demonstrated that female cuckoos that parasitised common redstart nests laid eggs that matched better than those that targeted dunnocks. Spectroscopy was used to model how the host species saw the cuckoo eggs. Cuckoos that target dunnock nests lay white, brown-speckled eggs, in contrast to the dunnock's own blue eggs. The theory suggests that common redstarts have been parasitised by common cuckoos for longer, and so have evolved to be better
Sabu also called Kem Sabu also called Kem Sabu called Kem was High Priest of Ptah, probably during the reign of Pepi I. His precise titles include "greatest of the directors of craftsmen belonging to the day of the festival of the Sun" (this is the main title of a high priest of Ptah), "priest of Sokar in the two houses" and "priest of Ptah. Sabu's mastaba (C 23) in Saqqara is described by Mariette. It is built of limestone. The cult chamber consists of only one room, that is decorated with agricultural scenes. Here was also found a statue, showing Sabu totally naked.