Crane chicks being fed.
Crane chicks sparring with each other.
Cranes following their keeper. Cranes learning to fly. Courtesy of the International Crane Foundation and Dave Erickson. The quest to breed the endangered whooping crane in captivity nearly foundered on the very imprinting problem that Konrad Lorenz discovered. When George Archibald, director of the International Crane Foundation , tried to breed his first whooping crane, the bird would not perform the breeding dance with fellow cranes because it was imprinted on people.