phil i have always tried to give a true reflection of our libs even informing members of peregrine attacks etc,given that somebody who will know somebody whose pal says it was not a good lib it seems the best way to do it, driver says up to 600 birds they will usually stick together, more than that they are most likely to split, very difficult for 1500 birds to stay together on lib and as long as they are getting a decent height i dont see it as an issue. hope this helps george