My neighbor across the street bought a flock block from a local farm store. It looks more like a peanut butter cement block. Her flock hops up on it and poops instead of pecking/eating it. Are there several brands of these blocks? Maybe she picked the wrong brand or are they all pretty much the same? I was hoping to pick one up soon. I've made my own in the past, which they LOVE, but I can't get it very hard and the gobble it up immediately. I used gelitan to bind the ingredients together.