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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Scientists have observed that the Australian songbirds make use of a secret password to identify their offspring and to protect their little ones from cuckoos. Various researchers have brought up evidence showing that the secret passwords have as aim to prevent the various food thefts which are carried out by cuckoos and other birds. In fact, scientists have explained that if the babies want food, they will need to produce the password which have been taught by the mothers themselves when they were unhatched. Scientific researchers have underlined that this remarkable example of prenatal learning is an adaptation that apparently allows fairy-wren parents to discriminate between their own babies and those of parasitic cuckoos who have invaded their nests. It is essential to note that the females also teach their mate and any helpers about the password by singing it to them in a solicitation song which are usually performed outside the nest. Hence, scientific experts have stated that the parents and other members can also feed the nestlings if their begging calls correspond...
