[3] In 1900, Forster Cooper travelled with John Stanley Gardiner to the Maldive and Laccadive Islands to undertake collections and study the formation of coral reefs.
From 1902 to 1903 he was naturalist to the North Seas Fisheries Commission Scientific Investigations, sailing around the Indian Ocean, taking soundings and collecting fauna and flora of the Seychelles.
[4] He returned to Cambridge University, where he organized an expedition to collect large mammalian fauna, including specimens of the gigantic rhinoceros Baluchitherium, from the Bugti beds of Baluchistan.
[5] During the First World War, he worked on human animal parasites at the School of Tropical Medicine in the University of Liverpool, which examined the action of quinine on malaria.
On his return to Cambridge University after the war, he held a variety of posts in the Zoological Laboratory, including lecturer and reader in Vertebrata, and was a fellow of Trinity Hall.
A large part of its collection was preserved in highly flammable alcohol in glass jars, and during the Second World War, the museum was bombed a number of times.