Following this, his on-screen work largely returned to appearing in ape costumes, such as the roles in "Captive Wild Woman" (1943), "Nabonga" (1944), "White Pongo" (1945) and as a prehistoric sloth in "Unknown Island" (1948). The original gorilla "mask" seen in films like "The Ape" (1940) was replaced with a subtler design with a more mobile jaw. Corrigan later sold his gorilla suits in 1948 and provided training in using them to their new owner, Steve Calvert, a Ciro's bartender. Calvert stepped into Corrigan's paw prints starting with a Jungle Jim film. Despite reports to the contrary, Calvert and Corrigan never appeared together on-screen in an ape costume. Since both Corrigan and Calvert eschewed screen credit playing gorillas, their film credits are often confused; any appearance of the "Corrigan suit" after 1948 is by Calvert.