Common cuckoo of two years. More than 100 host species have been recorded: meadow pipit, dunnock and Eurasian reed warbler are the most common hosts in northern Europe; garden warbler, meadow pipit, pied wagtail and European robin in central Europe; brambling and common redstart in Finland; and great reed warbler in Hungary. Female common cuckoos are divided into gentes – groups of females favouring a particular host species' nest and laying eggs that match those of that species in color and pattern. Evidence from mitochondrial DNA analyses suggest that each gene may have multiple independent origins due to parasitism of specific hosts
Common Bird Monitoring of India of time, these baseline data will fill a critical gap in the knowledge of these birds' ecologies. In the future, statistical analyses of these data can be utilized for directing conservation efforts and may help to initiate measures to protect these bird species from decline. These data are important for avian biodiversity in India and can be used as an advocacy tool. This program will also help to raise awareness and interest in the public regarding the conservation of common birds. Past examples of species that might have been helped by this kind of program include the critically endangered white-rumped