 Later she became interested in natural history and new ideas in Anthropology, Ecology and Ethology, such as those of her friends Michel Leiris, Georges Bataille.These inform the skeletal bird, fish and bat figures of her 1949 Hanover Gallery show, the haunting ape series, and her last, large "Migration" pictures.Rawsthorne's two years with Epstein and their mutual enthusiasm for Rodin developed her ideas about vitalism and movement, but she never became part of British Neo-Romanticism.