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4 results for “Cuculus canorus”
Egg laying behavior of the common cuckoo (Cuculus canorus): data based on field video-recordings
<p>The egg laying behavior of brood parasites is at the heart of studies on their co-evolution with hosts. Updating and reporting more egg laying behavior can improve our perception and insight on the brood parasitism process. During a 7 years' study period, we monitored 455 Oriental reed warbler (<i>Acrocephalus orientalis</i>) nests during the egg laying period, of which 250 were parasitized by common cuckoos (<i>Cuculus canorus</i>). We randomly recorded 53 clear videos of cuckoo parasitism, analyzed and recorded all parasitic behavior of cuckoo in details, summarized the process of brood parasitism displayed by the common cuckoo. Based on analyses of these field video-recordings, we proposed a new explanation for the egg removal behavior, namely the delivery hypothesis, i.e. the egg pecking and biting may help parasitic cuckoos lay eggs faster, thereby avoiding the host's attention and reducing host attacks, whilst egg removal is the side effect of egg pecking and biting. We concluded that common cuckoos do not care whether the host is around the nest, as they have a set of methods to deal with host attacks and can complete parasitism boldly and smoothly at any time.</p>
Red‐backed shrike (Lanius collurio) versus common cuckoo (Cuculus canorus): An example of ineffective cuckoo–hawk mimicry
<p><span>The red-backed shrike (<em>Lanius collurio</em>) used to be one of the most common hosts of the common cuckoo (<em>Cuculus</em> <em>canorus</em>). Nevertheless, during the last 30 years, there is increasing evidence from Central Europe that the occurrence of cuckoo chicks in shrike nests has become scarcer, and that in some locations they have disappeared completely. Multiple hypotheses have been suggested to explain this abandonment. Here, we test the hypothesis that shrikes vigorously attack adult cuckoos, potentially resulting in ineffective parasitism. Adult common cuckoos resemble in appearance the Eurasian sparrowhawk (<em>Accipiter</em> <em>nisus</em>), a common predator of small passerines. One hypothesis presumes that the cuckoo has evolved this mimicry to avoid attack by small passerines when searching for their nests. Our results show that shrikes defending their nests attacked cuckoos very vigorously, more often and more intensively than they did sparrowhawks. In the presence of a sparrowhawk dummy, parent shrikes only produced alarm calls and flew over the dummy. This suggests that cuckoo-hawk mimicry is ineffective in the case of shrikes and that they attack them much more often than they do any other presented intruder. Therefore, this activity could possibly result in the abandonment of shrikes as potential hosts for cuckoos.</span></p>
Red‐backed shrike (Lanius collurio) versus common cuckoo (Cuculus canorus): An example of ineffective cuckoo–hawk mimicry
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Egg laying behavior of the common cuckoo (Cuculus canorus): data based on field video-recordings
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