If a 25lb raccoon is jumping up and down on the wire roof is it going to remain 2.5 feet from the perch? IMO you are borderline safe from reach even at say a 3 foot distance... If the Guinea is spooked by the coon (likely) and stands up on the perch to their typical alerting stance with an average height of nearly 2 feet he/she will be within about 6 inches of the fence if it's not sagging a bit from the 25lb coon, plenty easy for most coons to grab a hold of the head...
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