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
International Bird Rescue International Bird Rescue Research Center, the organization cares for an estimated 5,000 birds annually at two rehabilitation centers, the Los Angeles Oiled Bird Care and Education Center and the San Francisco Bay Oiled Wildlife Care and Education Center, that also serve as primary care facilities for oiled birds in the event of a spill in California. Common bird species treated include brown pelicans, common murres, western grebes, pacific loons, and a variety of gulls, herons, and other waterfowl. International Bird Rescue is a member of the Oiled Wildlife Care Network (OWCN), which is managed by the UC Davis School of