I have done a little digging, as there are only so many things that make neat pellet like things. Interestingly, I found some info on owls that made more sense given the odd size/location.
Unlike fecal pellets, owl pellets are formed from undigestible parts of their food, such as fur, bones, feathers, and scales. These pellets are coughed up by the owl after eating a meal. Smaller pellets possibly come from a smaller owl. The varying shape and color of the pellets are formed based on the particular diet of the species' locale
Literal entire thing about different owls and different pellets. I have no idea if this is your cause and effect. But I can see an owl sitting in one spot just spitting out its leftover pellets to the foliage below.
Good luck with the elephant.