Hear the crunch, crunch, crunch of the shell-covered Indigo Trail on our hike with Ranger Toni Westland at Sanibel Island's J.N. "Ding" Darling National Wildlife Refuge. The 6,400-acre refuge is home to endangered and threatened species as well as over 245 species of birds. Our visit to the four-mile, round-trip Indigo Trail includes a stop at the Wildlife Education Boardwalk for a lesson in scat. Recorded July 30, 2020. "Ding" Darling Wildlife Society, Instagram