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  1. vaibhavmaskar
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    #1

    when they can fly fledge fewer of their own chicks than do crows which fledge ...

    Daniela Canestrari of Oviedo University, in Spain, and her colleagues looked at relations between great spotted cuckoos and carrion crows. Unlike some nest parasites, great spotted cuckoos do not evict the eggs or young of their hosts. They do, however, compete with them for food. The upshot is that crows which raise both their own and cuckoo nestlings to the point when they can fly fledge fewer of their own chicks than do crows which fledge a clutch without cuckoos. This suggests, as might be expected, that cuckoos are a bad thing.

    Dr Canestrari, however, decided to look a little deeper. She suspected that though their fledged clutches were smaller, crows with cuckoos in the nest were more likely to fledge at least some young than were unparasitised crows. That might be enough to compensate for the lower number of fledglings per nest.

    Could anyone explain the meaning of this sentence in easy way?


    http://www.economist.com/news/scienc...-paying-guests (source)

  2. Raymott's Avatar
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    #2

    Re: when they can fly fledge fewer of their own chicks than do crows which fledge ...

    "Fledge" means to care for a young chick until it is able to fly.
    Cuckoos are known for laying their eggs in other birds' nests, expecting the other mother bird to fledge them. Hence they are 'parasitic'.
    "The upshot is that crows which raise both their own and cuckoo nestlings to the point when they can fly fledge fewer of their own chicks than do crows which fledge a clutch without cuckoos."
    Crows which fledge their own young plus cuckoos (ie. which raise both their own and cuckoo nestlings to the point when they can fly), fledge fewer of their own chicks.

  3. vaibhavmaskar
    Guest
    #3

    Re: when they can fly fledge fewer of their own chicks than do crows which fledge ...

    I am still confused.


    1. fewer of their own chicks than do crows -what is the meaning of "than do crows"?
    Last edited by vaibhavmaskar; 08-May-2014 at 03:26.

  4. Raymott's Avatar
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    #4

    Re: when they can fly fledge fewer of their own chicks than do crows which fledge ...

    "than do crows which fledge a clutch without cuckoos." = "than crows which fledge a clutch without cuckoos do."

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