Rooster's making an odd sound

My roosters make a sort of shrill, but low-volume noise when alerting to predators. Was something big flying overhead or maybe a cat or dog hanging around?
 
My roosters make a sort of shrill, but low-volume noise when alerting to predators. Was something big flying overhead or maybe a cat or dog hanging around?
sorry for the late response, and I'm not sure if there was anything, but squirrels do climb on my fence a lot so I think you might be right.
 

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