The chicks of a species of Australian cuckoo can adjust their call in order to fool other species into rearing them, despite never having heard the cry, researchers have found.
Like their European counterparts, Australian cuckoos are well known for laying their eggs in the nests of other birds.
Once the chicks hatch, they kick out the host's other eggs and set about convincing their foster parents to feed them by imitating the calls of the host's offspring.
But researchers from the Australian National University and the University of Cambridge, report in the latest issue of the journal Evolution, that one species of cuckoo can modify its call depending on which species it has hooked up with.
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