Researchers from the Cornell University in US and Flinders University in Australia had earlier discovered that Superb Fairy-wren nestlings learn to imitate their parents' calls while still in the egg.
    
They wanted to see whether the behaviour extended to other species and to learn more about its ecological context. So they turned to the related Red-backed Fairy-wren.
    
All Red-backed Fairy-wren females in the new study called to their eggs while incubating, and most continued to call to their nestlings for five to six days after they hatched.
    
As a result, mother and offspring calls were more similar than would be expected by chance. Parents also put more effort into feeding nestlings with calls similar to their own.
    
"Fairy-wrens have become a new model system in which testnew dimensions in the ontogeny of parent-offspring communication in vertebrates," said Mark Hauber from Hunter College in New York.
    
Though the researchers had hypothesised that fairy-wren parents could use calls to identify alien nestlings, the result of eggs placed in their nests by parasitic cuckoos, the rate at which Red-backed Fairy-wren mothers called to their eggs did not increase significantly when more cuckoos were present in the habitat.

Researchers speculate that the similarity of nestlings' calls to their own could also tip parents off about which nestlings are the most vigorous and the best learners, so that they can invest more resources in the ones most likely to thrive.

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