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
Common linnet common linnet instead to express the limitations of poetry - concentrating on the difficulty in poetry of conveying the beauty of a bird's song. He wrote in the first verse: The musical features the song "Green Finch and Linnet Bird," in which a young lady confined to her room wonders why caged birds sing: Common linnet The common linnet ("Linaria cannabina") is a small passerine bird of the finch family, Fringillidae. It derives its scientific name from its fondness for hemp and its English name from its liking for seeds of flax, from which linen is made. In 1758 Linnaeus