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
Bird Creek Creek and had threatened to close some of the oil wells nearest the site. Bird Creek Bird Creek is a stream in northeast Oklahoma. The main creek is formed from the waters of North Bird Creek, Middle Bird Creek, and South Bird Creek, all of which rise in Osage County. The South and Middle branches of the creek converge at Bluestem Lake. Outflow from the lake is called Middle Bird Creek. North Bird Creek joins Middle Bird Creek northwest of Pawhuska, and from that point on is simply Bird Creek. From Pawhuska, the creek flows southeastward and eastward through the