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Defending and refining the Birch et al. (2021) precautionary framework for animal sentience

B. Fischer,Joseph Gottlieb,A. Schnell,M. Barrett

Published 2025 in Animal Welfare

ABSTRACT

It is widely accepted that we ought to avoid taking excessive risks of causing gratuitous suffering. The practical implications of this truism, however, depend on how we understand what counts as an excessive risk. Precautionary frameworks help us decide when a risk exceeds the threshold for action, with the recent Birch et al. (2021) framework for assessing invertebrate sentience being one such example. The Birch et al. framework uses four neurobiological and four behavioural criteria to provide an evidence-based standard that can be used in determining when precautionary action to promote invertebrate welfare may be warranted. Our aim in this discussion paper is to provide a new motivation for the threshold approach that the Birch et al. framework represents while simultaneously identifying some possible revisions to the framework that can reduce false positives without abandoning the framework’s precautionary objectives.

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