John Sterling Rockefeller

In July 1928 Rockefeller, his Yale classmate Charles B. G. Murphy, and the Canadian collector and taxidermist Allan Moses went to Africa on an ornithological expedition to collect specimens for the American Museum of Natural History.[2] The survey was funded by a grant of approximately $150,000 from the Rockefeller Foundation.[3]^: 59 The main goal of the expedition was to find and collect the rare Grauer's broadbill, which was known only by one 1908 specimen in the Walter Rothschild Zoological Museum in England, and which had eluded collectors for twenty years.[4]

On July 26, 1929, in a mountainous area at the northern end of Lake Tanganyika, Moses was the first to find and shoot a Grauer's broadbill.[4] The party collected several more broadbill specimens and spent a further three months collecting before returning to the United States.[3]^: 101

In order to thank him for his work on the expedition and for collecting the first Grauer's broadbill, Rockefeller undertook to purchase three small islands near Allan Moses's home on Grand Manan Island in the Bay of Fundy and make them a bird sanctuary. The common eider population had been declining for several years and there were estimated to be at most 30 breeding pairs from the Gulf of Maine southward along the Atlantic Coast. Most of these nested on Kent Island, one of the three islands in question.[5]

The owner of Kent Island, the largest of the three, sold it for $25,000, but the owner of the two smaller islands refused to sell them.[3]^: 104 Rockefeller hired two resident wardens for Kent Island, one of whom was Moses himself. They moved to the island in June 1930 and over the following years the eider population increased dramatically, reaching several hundred nesting pairs by 1935.[3]^: 114

In 1936, after visits to Kent Island by scientists including Ernst Mayr and Alfred O. Gross of Bowdoin College, Rockefeller donated the island to Bowdoin College as a research station in exchange for the nominal fee of one dollar ($1.00) and the college's commitment to maintain it as a bird sanctuary.[5]

Rockefeller funded a 1932 ornithological expedition to Timor and Sumba under the direction of Erwin Stresemann. Ernst Mayr later studied the resulting collection.[6]^{: 121–122}

Rockefeller is commemorated in the names of two birds. Turdus poliocephalus sterlingi (Sterling's thrush) is a subspecies of island thrush which was described by Ernst Mayr in 1944. Cinnyris rockefelleri (Rockefeller's sunbird) is found in Central Africa. It was described by James Chapin in his 1932 work The Birds of the Belgian Congo, Part I.[7]