On Ebay I saw a trigger feeder that operated like the water nipple. The chicken pecks at the nipple and several pellets fall into a tray that they eat. The movement of the pellets seems to attract their attention so more are eaten rather than wasted. But there was only one source and its in UK. Does anyone know 1. If they work, and 2. If they are available in US? Also saw spring feeder, similar action, but also only available in UK.