Fairy-wren chicks taught secret passwords to thwart dickish cuckoo birds

Cuckoo birds have evolved a nasty habit of laying their eggs in the nests of other bird species, who then unknowingly tend to their young. But as new research published in Current Biology reveals, the fairy-wren has developed a rather ingenious countermeasure: Expectant mothers teach their unhatched offspring a… »11/09/12 11:30am11/09/12 11:30am