As Wisconsin and other states eye possible legalization of marijuana for medical or recreational use, many effects of using cannabis are still not fully understood.

From the outside, Tricklebee Café in Milwaukee's Sherman Park looks like any other restaurant. Upon entry, however, it becomes clear that this café is different.

While a variety of people have found success treating their medical ailments with cannabis, the drug remains illegal in Wisconsin.

How can all of the state's tiny, elusive nocturnal flyers be counted? That's not possible. But the downward spiral of several bat species in Wisconsin can be tracked through the work of passionate conservation professionals, specialized technology and, crucially, legions of enthusiastic volunteers.