Bog turtles enjoy a huge range of human-listed status, "Endangered" being the one most commonly used from state to state. One of the problems is that these guys do not like to be found, so we (wetland biologists) actually have no idea how many bog turtles there are. All we can do is calculate how many bog turtles we expect to live in high quality habitat, and multiply that times the amount of high quality habitat, and I guess that's how many turtles we have? Sound scientific? It's not! But it's the best we can do with these secluded guys.
So, as the continent warmed, humans expanded our range. The mammoths all died, either through hunting or as a result of climate change. By the 1800s, all the elk and bison had been removed from the east coast as well. Leaving a few deer, and lots of cattle. Bog turtles continued to do well through the mid-1900s thanks to poor grazing practices (allowing cattle to graze in wetlands), and once we stopped that, an interesting thing happened. The wetlands turned into different types of wetlands..........wetlands that cannot support bog turtles.
Now, Maryland DNR, Pennsylvania DEP, NYDEC, and other agencies are paying landowners to cut trees in wetlands, spray herbicide in wetlands, and even graze goats in wetlands, all to support the few remaining healthy populations of bog turtles.
It's a good thing....but it kinda makes you wish we hadn't killed all the bison. A debate for another time...........were our bison a separate species (extinct 1825), or plains bison. I want to see a Nerd Cage Match over that.