Canada has the best by far : the beaver. They cut down trees to build dams for their aquatic base. Their biological toolkit to be able to achieve that is impressive; their teeth, hands and feet, tail, pelt, all created or evolved (whatever you prefer) to make them builders. And the yuge amounts of power we generate here in French Kanada is hydro-electric, it comes from massive dams that were built in past decades. Surely the beaver is connected in some way to that, no?