Hudson was an advocate of Lamarckian evolution. He was a critic of Darwinism and defended vitalism. He was influenced by the non-Darwinian evolutionary writings of Samuel Butler.Haymaker, Richard E. (1954). From Pampas to Hedgerows and Downs: A Study of W. H. Hudson. Bookman Associates. p. 197Miller, David. (1990). W. H. Hudson and the Elusive Paradise. Palgrave Macmillan. pp. 78–82. He was an early member of the Royal Society for the Protection of Birds.
