Try as we might to battle back those most unwanted of weeds, even our most advanced landscaping tools are often ineffective in staving off the fast-growing onslaught.

Thankfully, there's backup.

Schlitz Audubon Nature Center, a wildlife sanctuary outside of Milwaukee, is suppose to be a haven for local biodiversity -- but two particularly nasty invasive plant species, Buckthorn and Honeysuckle, had other plans. Since the weeds first found their way into the area, they've now come to occupy much of the sanctuary's 180-acres, towering over native species and deterring visits from birds and other animals.