From the San Francisco Chronicle:
“Turtle No. 13 is pretty much like western pond turtles everywhere. … But then there’s the 8-inch antenna on her back. She and each of her 23 cohorts in a secluded Mount Diablo pond are affixed with radio transmitters on their shells so scientists can track their every poky, mud-filled move.
“Western pond turtles, the state’s only native turtle, are a ’species of special concern, according to the California Department of Fish and Wildlife.”