1. Allen, Colin and Mark Bekoff, Species of Mind: The Philosophy and Biology of Cognitive Ethology (Massachusetts, US: Massachusetts Institute of Technology, 1997).
2. Animal Aid, Outrage, Issue 208, Autumn 2022 (hard copy: Animal Aid’s campaign magazine). For Animal Aid’s website see: https://www.animalaid.org.uk/.
3. Attfield, Robin, ‘Biocentrism, Climate Change, and the Spatial and Temporal Scope of Ethics’, in Brian G. Henning and Zack Walsh (eds.), Climate Change, Ethics and the Nonhuman World (New York; and Oxon, UK: Routledge, 2020), pp. 63–74.
4. ——— The Ethics of the Global Environment, second edition (Edinburgh: Edinburgh University Press, 2015).
5. ——— Environmental Ethics: An Overview for the Twenty-First Century, second edn. (Cambridge: Polity, 2014 [2003]).