Not BS!!! If a cow is 5' tall on one feeders legs it is also 5' tall on another feeders legs. The variable is the distance away from the legs. Math wasn't your deal was it?
Right, distance from the feeder is the variable. Which makes a pic of a different feeder at a different distance pretty much useless as a comparable. The idea is to have a constant in the pic with a known height/length to be able to compare to. And yes, math is my thing.