That’s a tough one! So many spp go extinct before we know even the basics about them, and the ones that get a lot of research tend to be in decline for a long time, so the impact feels small when it happens, even if, say, thylacines probably had strong top-down impacts on Tasmanian ecosystems
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https://doi.org/10.1111/j.1523-1739.2003.00230.x