I was inspired to write about beavers by the text about keystone (keystone) species and my consideration of whether such a thing exists at all. Modern ecology and conservation biology introduce concepts and terms, the consequence of which is a tendency to consider some species more important than others (such as keystone/key species, charismatic, flagship, umbrella, etc.). Any attempt to rank or polarize species arouses my skepticism, as I believe (in line with a holistic approach close to me) that everything affects everything. Nevertheless, it is hard to deny that some species seem to have a stronger impact on their environment than others.