We have these things called binoculars, telescopes, cameras and drones. All of which are able to observe subjects from a safe distance.
I suspect that the number would be around a 50% split, what would then be interesting is determining which group has a better diet and survival rate to determine which tactic is superior.
Not having the time or funding to perform my own study does not invalidate my criticism that the authors used an incomplete and flawed data set.