Biodiversity is one of the most valuable aspects of a natural ecosystem and a geographic location in general. Monitarily, culturally, spiritually, and in terms of human liveability and comfort. It’s the most important aspect in determining the amount of what are called ecosystem services an area gets, and of biodiversity always results in the area going to shit. Prime examples of said going to shit are whenever an invasive species we brought in starts outcompeting the native species, or every time we try to cull a native species we consider a nuisance, sometimes the former is caused by the latter!. So, even if we’re only considering ourselves, without even having to get into any kind of ethical “do animals deserve rights” or philosophical “what does it mean to be a member of the Earth’s ecosystem” debates, we still need to preserve other species, for us if nothing else.