Eggs are capable of learning

Scientists have found that Australian wrens to combat cuckoo teach their chicks special trills password, with even before they have time to hatch.

Unusual behavior wrens scientists noticed when recording urging females, those who publish the appearance of predators. Biologists have noticed that the "free time" for the birds sing not yet hatched eggs. The song contained the same notes in which the female begging for food from the male. When the chicks were born, it was found that all the food they made the same appeal, which, however, differed from the nest to the nest. In each case, to include those notes, which were contained in the song of the female.

Using sound passwords necessary to Wren to not expend energy on education kukushat. Scientists however, encountered for the first time that learning occurs before hatching. According to the authors, this is due to different rates of development in the embryo wrens and cuckoos. Recent hatch earlier and did not have time to learn the song that the female begins to sing only on the tenth day after laying eggs.

via factroom.ru