Hi jerry. Glad to share in your latest experiences. Not to hijack your thread but you mentioned your curiosity about that caribou being on his own.
While I'm no expert in caribou as their migratory behaviour is vastly different than elk or moose, I am guessing some of their herding aspects are similar.
By all appearances, that would be a young bull. Normally, the older or more dominant bulls will take charge of the groups of cows, especially now that they are getting close to rut (when the cows are in heat).
So the young fellas are pushed out and end up on a search for their own little group of gals. Guessing that's what your man was up to.
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