This is an image of GPS tracking of multiple wolves in six different packs around Voyageurs National Park, Minnesota, which shows how much the wolf packs avoid each other's range [source: https://t.co/BYFdDNCIOi] pic.twitter.com/MRKpw2KA9b
— Massimo (@Rainmaker1973) December 7, 2018
The reason dogs are obsessed with sniffing ad marking trees is because wolf packs are surprisingly good at observing borders.
Commenter Sean observes:
The collective lupine barbershop yodelling carries for many miles and conveys the message: “WE are over here and there are MANY of us”.
The other pack hears this and starts up “Over here we prefer quality to quantity, but you would be surprised at our numbers”
I presume humans bred howling out of dogs because it interferes with sleep?