How much observing is required to discover what Dall sheep eat..?  Obtaining samples of the food they eat can be accomplished without netting and collaring animals, but I don't see what the point is of even doing that.  So they know the precise nutritional content of the food they eat.  Now what?  Are they going to collaborate with Monsanto to create a better tundra?  The sheep are "skinnier than anything we've ever seen".  Not sure how this could not be estimated using non-intrusive techniques.  And, again, what do they plan on doing with this information?  Is it really worth buzzing animals with helicopters and all of the costs that entails to obtain it?  You'll have to pardon my skepticism.