Exclusion is the process of preventing animals from gaining access to something.
Exclusion describes repairs or upgrades that prevent animals from accessing, for example, a building. The term can also be used to describe an addition of a barrier that prevents animals from going under or over a fence, or accessing a garden or patio area, or a vegetable garden or individual tree.
Wildlife conflicts are not resolved by removing the 'offending' animal(s) because new individuals quickly fill the vacancy.
1 - 1 = 1
This is why any strategy that focuses on removal of the animal(s) will fail in the long run, and be more costly.
For example, let's say there's a building with a few breaches on the exterior, allowing rodents or small mammals to gain access. No amount of poison or trapping and removal will resolve the fundamental issue - the holes in the structure.