Almost Marc. Apparently there was a mega extinction 250 million years ago over an 80,000 year period in which 95% of all life on earth died. It’s called the Permean Extinction. This was way, WAY before dinosaurs and whales and dolphins. There is speculation that a cow like mammal called the “listosaurus” survived, from which all mammals (including us) eventually evolved. My point here is that it’s taken at least 65 million years, and probably 250 million years for the flora and fauna as we know it today to evolve.
And THAT is where the sadness comes in. I’m told that for every extra billion humans on the planet, as a rule of thumb, you can safely kiss goodbye at least 10,000 species of animal life - that is, birds, marine life, insects, mammals, and reptiles. They all suffer sadly.