Originally Posted by JLibourel
Just doing a little calculation here. If deer are the primary prey of BFs, as is claimed above and there are 10,000 BFs in North America, the toll they must take on deer herds must be enormous. The usual statistic is that a mountain lion must kill one deer a week to survive. Now a BF must weigh at least 4X to 5X a mountain lion, if most estimates of size are correct. Let's be conservative, though, and estimate that a BF would need to kill and eat only three deer a week. If the 10,000 estimate is correct, then that would mean that BFs are killing more than 1,500,000 deer annually. You'd think wildlife managers would take some notice of the terrible toll these creatures are taking on our deer herds!
I considered that. Deer are not the only food by a long shot. Rabbits, racoons, fish, pine nuts, acorns, walnuts, berries, crustaceans, crayfish, roots. In addition, farm fruit such as apples, and veg such as corn and the like.
Caloric requirements generally decrease as a function of total mass of an animal, probably around 5,000 per day for its size. Pretty sustainable. You're calculations are not taking this into consideration, nor are you taking account of variation in the diet. Its believed to be an omnivore.
And 10k I suggested is a spit in the wind. It would need at very minimum 3k to have a breeding population. 10 is just a round number.
Lastly, across the population, if it is 10k, many are young and not eating nearly as much.