It’s not all bad for crow chicks who have to share their nest with an uninvited pushy guest such as a cuckoo youngster. For one, they can sit back and wait for food to arrive while the cuckoo chick does all the begging for nourishment. So says a researcher who led a study into the pros and cons associated with the parasitic relationship of the great spotted cuckoo with the carrion crow. - Source
A beggars banquet: Carrion crow chicks sit back while cuckoo chick does all the begging
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