Beavers were hunted for their furs and their populations were decimated in many areas of the US. Their decline greatly affected entire ecosystems. Man greatly underestimated their contribution to the health of Earth. NASA has taken a keen interest on these contributions and is keeping track from above. One example is a beaver dam that is 2x the size of Hoover Dam. #Nature #science https://youtu.be/w4FB9Omjn94