With a distinctive black head and underbody, gray wings, back, and tail, Black Terns (Chlidonias niger) are easily distinguished from any other tern species in the state. They are also the smallest tern species to occur in Michigan, with an average length of only 9.75 inches and a wingspan average of 24 inches. In Michigan, they are a species of special concern and arrive in late April or early May. This location is one of the best and easiest spots to see them flying gracefully over the Flats. They nest from late May to early August, and usually leave by the end of September. They breed in scattered colonies, and the nest site is low in the marsh, on a floating mat of plant material, or on an old muskrat house or debris.
The cache is a large peanut butter jar, borderline small/regular, so I'm calling it a regular. You will need to bring the writing implement of your choice. There is ample parking on the shoulder of the road. The container is not in the crotch of the tree, but just below it. I would not recommend reaching into the tree crotch as it looked like it had been used by a Raccoon as a bathroom.