This varmint is wrecking my fence posts, but oh, the little wussy is protected by the Migratory Bird Treaty Act
[DOC] [TLE] How to Join Two 4 X 4 Fence Posts - Lesson.Website [PAR] Dec 2, 2015 ... Due to the size and weight of 4-by-4 fence posts, creating a strong ... the two 
wood pieces together without ruining the straight facade of the posts.