Evans was a member of the International Union of Directors of Zoological Gardens (now known as the World Association of Zoos and Aquariums) and a founding member, in 1966, of the National Federation of Zoological Gardens of Great Britain and Ireland (now known as the British and Irish Association of Zoos and Aquariums). Evans collaborated with Badham (and writer Maureen Lawless) to write two books documenting their lives and the foundation of Twycross Zoo: Chimps with Everything (1979) and Molly's Zoo (2000). Evans and Badham continued to hand-rear abandoned chimpanzees in their house until 2000 but retired from the zoo in 2004. Badham died in 2007 and Evans died on 9 September 2016.
