Common Cuckoo (Cuculus canorus) lives in open woodland across Europe, Asia, Africa. It feeds on insects and caterpillars. Its conservation status is Least Concern.
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A real field recording of the Common Cuckoo, made in the wild.
The barred underparts of the common cuckoo resemble those of the Eurasian sparrowhawk, a predator of adult birds. A study comparing the responses of Eurasian reed warblers, a host of cuckoo chicks, to manipulated taxidermy model cuckoos and sparrowhawks found that reed warblers were more aggressive to cuckoos with obscured underparts, suggesting that the resemblance to sparrowhawks is likely to help the cuckoo access the nests of potential hosts. Other small birds, great tits and blue tits, showed alarm and avoided attending feeders on seeing either (mounted) sparrowhawks or cuckoos; this implies that the cuckoo's hawklike appearance functions as protective mimicry, whether to reduce attacks by hawks or to make brood parasitism easier.
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 gente may have multiple independent origins due to parasitism of specific hosts by different ancestors. One hypothesis for the inheritance of egg appearance mimicry is that this trait is inherited from the female only, suggesting that it is carried on the sex-determining W chromosome (females are WZ, males ZZ). A genetic analysis of gentes supports this proposal by finding significant differentiation in mitochondrial DNA, but not in microsatellite DNA.
A female may visit up to 50 nests during a breeding season, laying only twelve to twenty-two eggs in total. Each egg measures 22 × 16 mm and weighs about 3.2 g. The cuckoo's chicks hatch after 11-13 days, then evict all host eggs and nestlings, growing to three times the size of an adult reed warbler by day 14. This relentless strategy lets the chick monopolise the host's food, ensuring its rapid growth despite the loss of its own parents' care.
Globally the common cuckoo numbers between 25 million and 100 million individuals, with roughly 12.6 million to 25.8 million breeding in Europe alone. Despite this, the longest recorded lifespan in the United Kingdom is just 6 years, 11 months and 2 days.
Common cuckoos specialize in eating hairy caterpillars, especially those of garden tiger moths, which are bitter and avoided by most birds. By consuming these crop-destroying insects, cuckoos help keep pest populations in check, protecting crops like raspberries, viburnum and honeysuckle.
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As the Common Cuckoo glides effortlessly across the sun-dappled landscape, its sleek, grey-brown plumage blending seamlessly into the shadows, it embodies the very essence of stealth and cunning, a master of deception that has honed the art of parasitic breeding to perfection. With a haunting, melodic call that echoes through the woodland, this elusive bird weaves a trail of mystery and intrigue, its nomadic wanderings taking it from the scorching savannas of Africa to the lush, verdant forests of Europe. As it moves with silent precision, its sharp eyes scanning the underbrush for the perfect host, the Common Cuckoo reveals itself to be a remarkable and enigmatic creature, full of secrets and surprises.
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