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"Dirty" cuckoo: mimic other birds, predators call the opportunity to spawn

  • Author:chinatopwin
  • Source:chinatopwin
  • Release on :2017-09-13
Beijing on September 11th news, according to foreign media reports, the cuckoo in the animal 
kingdom because they love in the One's reputation was a byword., spawning other birds in the 
nest, forcing them to small cuckoo as their children to feed. A new study shows that female 
cuckoos mimic other birds by natural enemies call them away, and then took the opportunity to 
spawn in their nests.
The cuckoo called "brood parasitism" (brood parasitism), which is one of their animal trick, let the 
other species for their children. Generally speaking, the others were forced to raise children and 
spend more time and energy to animal rearing, their children often suffer. There are a lot of a 
cuckoo tricks means, such as let the egg color close to the "parent" eggs, and eggs in their nest 
in the fast, high efficiency.
The scientists found in a new study, Rhododendron there is another kind of deceitful trick. The 
study by University of Cambridge ornithologist Jennifer Yorke (Jennifer York) and Nicholas Davis 
(Nicholas Davies) study showed that the female cuckoo in the reed warbler (reed warbler) nest 
shortly after, will imitate the Sparrowhawk (Sparrowhawk) the hawk is barking. Reed warbler 
predators, the former heard the cry, will not dare to return to reed warblers nest, so the cuckoo 
can stay longer, increase the probability of successful. Finally, reed warbler returned to the nest, 
not realizing that some opportunistic molecules have left their eggs here.

An ordinary cuckoo
The cuckoo likes to spawn its eggs in the nest of a reed warbler

Study on York and Davies solved a mystery about the long time since cuckoo cuckoo. Male 
and female are significantly different sounds such as laughter, similar to the "kwik-kwik-kwik", 
so also known as "cuckoo cuckoo". However, the female cuckoo eggs in other birds nest will 
make this sound. Scientists confused, unable to understand why the female cuckoo to make 
such a dramatic move in attack. York and Davies speculated that the female cuckoo is in fact 
the imitation krogulec "kiii-kiii-kiii" sounds.
The researchers conducted an experiment to prove this point. They recorded the male and 
female cuckoo hawk, and a gray (grey dove turtledove of reed warbler is not a threat here as 
control), and then in the wild to play reed warblers to listen. When they heard the cuckoo and 
the dove gray male cry, no response. But the female cuckoo heard "kwik-kwik-kwik" sounds 
when they heard the horror and cry Sparrowhawk almost. This makes them alert, immediately 
leave the nest, and far away, until they feel the danger so far.
"The cuckoo cries krogulec simulation can disperse the host birds attention, let them leave the 
nest, in order to improve the success rate of parasitic." the study authors wrote in the report, 
"in this field in the struggle of anti cheat," cuckoo may laugh at the end. ""

The female cuckoo hawk can imitate the sounds.

Reed warbler heard the female cuckoo and Sparrowhawk cries, will enter the "alert" mode.
In order to ensure the correct study method, York and Davies carried out the same experiment 
with tits. The bird and the goal is not to start the cuckoo, prey but also krogulec. In response to 
the female cuckoo calls of tits and Sparrowhawk, further confirmed that the female cuckoo 
"kwik-kwik-kwik" sound is in imitation of host birds natural enemies.
The study results show that the female cuckoo to increase the chances of success, even forced 
female reed warblers of dilemma, which had to protect its own security, abandoned children in 
that way. If he died, the children still unattended, so the best way is usually run away -- median 
wants. The study also showed that the cuckoo, cuckoo this varies by gender, but also by the 
habits of the brood nest provides convenience.