[1] He visited Jamaica in 1906 and collected over 100 birds there, but his trip was cut short by dengue fever.

His collection of over 10,000 mammalian skins and skulls, including over 100 type specimens, was presented to Harvard College in 1899.

In 1908 his collection of over 24,000 bird skins was presented to the Museum of Comparative Zoology, and he went on to increase it.

In 1925 he went to Europe, visiting museums and ornithologists and arranging scientific exchanges.

He wrote over 70 books and articles, 55 of them on mammals ...[2]He died at his summer home at Wareham, Massachusetts.