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 Bird Monitoring of India Common Bird Monitoring of India The Common Bird Monitoring Program is a citizen science bird monitoring program of India. It is a pioneer project that aims to engage general public in the collection of baseline data on 18 common bird species. Data collected will be used to map species abundance and distribution throughout the Indian subcontinent. The program is an initiative of the Nature Forever Society, supported by the Jaypee Group. It was launched in the city of Mumbai on World Sparrow Day, 20 March 2012. Bombay Natural History Society (BNHS), Mumbai launched its Common Bird Monitoring Program in 2015.