Where the Buffalo Roam, Lolo, Montana

Sing it with me, now: "Hoooome, home on the range!...."This Lolo, Montana, bison herd is one of the sights to be seen any day of the week. 
One Friday evening, coincidentally just as I was coming around the curve where this herd is pastured, I heard this Groaner Friday joke on SOS Radio:
Q: What did the daddy buffalo say to his calf who was leaving for school?
A: Bi-son!
(Grooooan!)