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With three hearts, blue blood, no bones and eight limbs attached to a bulbous head, octopuses seem like they’re from another planet. But in My Octopus Teacher, the hugely popular nature documentary on Netflix, these cephalopods as not only presented as remarkable — but relatable.

How many bird and mammal extinctions has recent conservation action prevented?

Aichi Target 12 of the Convention on Biological Diversity (CBD) contains the aim to ‘prevent extinctions of known threatened species’. To measure the degree to which this was achieved, we used expert elicitation to estimate the number of bird and mammal species whose extinctions were prevented by conservation action in 1993–2020 (the lifetime of the CBD) and 2010–2020 (the timing of Aichi Target 12). We found that conservation action prevented 21–32 bird and 7–16 mammal extinctions since 1993, and 9–18 bird and two to seven mammal extinctions since 2010.

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In this commentary, Michael Brown of Satya Development International, Beth Allgood of the International Fund for Animal Welfare, and a number of co-authors (see the full list at bottom) argue that the Covid-19 pandemic affords an opportunity for conservation to evolve away from underperforming bu