Insect Poop Like Droppings Under Birch Tree

Question From: a. buchanan - Travelers Rest, South Carolina, United States
Q: what are the poop like droppings on my patio under a birch tree every day. It looks like insect poop.

A: I have no way of knowing, as I am not a poop specialist. Take photos, closeups included to a good independent garden center for an accurate ID and solution. Best And Happy Yardening, Nancy