The Minnesota Zoo is doing a survey of the biological diversity of its own grounds to share with visitors the native plant and wildlife bonanza that lives there. Many other zoos likely have rich native biodiversity to be explored in their literal own backyards. As usual, the Minnesota Zoo is pioneering a good idea here.
Minnesota Zoo surveys plants, animals found outside the exhibits - TwinCities.com
Minnesota Zoo surveys plants, animals found outside the exhibits - TwinCities.com