link to open access paper https://royalsocietypublishing.org/rspb/article/293/2082/20262436/484055/Inevitable-fates-The-recovery-potential-of-small

Our findings give a potent reminder of the ongoing tragedy of contemporary extinctions, with at least 39 species of birds and mammals that were extant in the middle of the twentieth century no longer with us 75 years later. But they also highlight a similarly sized group that has perhaps been less well appreciated as a collective: the 33 species that, having dropped below 50 individuals, managed to avoid extinction and reverse their decline to at least double in size to 100. That level remains critically low, but recovery in this group has predominantly been far stronger: 27 of these species now exceed 250 individuals and 11 exceed 1000. These recoveries are striking, and their apparent associations with direct conservation intervention are compelling: 61% of species that received direct action recovered to at least 100 individuals, compared with 2% of those that did not, and modelled odds of recovery to ≥100 and ≥250 were several times higher among species subject to direct action.

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Extinction in the presence of action to mitigate limiting factors is strikingly rare, occurring for just two species: the Aguijan reed-warbler (Acrocephalus nijoi) and the poʻouli. In neither case is there any suggestion that the drivers of decline were meaningfully alleviated before the species’ demise [29,52], and so neither is a compelling example of the extinction vortex in action.

Honestly I have a hard time thinking of any better good news in a way when you think about the implications of this.