Letters from William Henry Hudson to Philip Lutley Sclater regarding cuckoos, shipments of birds to the Smithsonian, Woodpeckers in Argentina, Blackbirds and other birds

Correspondence with Gerald Durrell regarding animals to be deposited at London Zoo, the exchange of Gough Island Moorhens for a pair of Rheas, a publication by the International Union for the Preservation of Nature on extinct and vanishing birds, a trip to Argentina, the diet of Giant Pangolins, and the care of Notornis