This is the case when grizzly bears respect each others comfort zone. The head in the lower right corner belongs to a very large female which is not a threat to the mother and cubs but they still have their own fishing areas. The single grizzly dominated the better fishing area near the entrance to the spawning channel while the mother and cubs caught all the salmon they needed a little lower on the river. The abundance of salmon in this area means there is little need to fight and therefore less chance of an injury that could reduce the ability to catch salmon. It is all about fattening for hibernation and fighting is counter productive.