Penza, 24 April 2013. PenzaNews. Black swans, herons, shelducks, Mandarin and Karolinka were transferred to open-air display area in Penza zoo.

According to the administration of the zoo, these birds are the pearl of the zoo collection.

“During the time the birds have been here, they produced offspring more than once. We hope that this year they will again bring the visitors joy of seeing their chicks,” the zoo administration noted.