In a comment on my recent post about the goldfish I've introduced to the pond CJ mentioned that a heron was their most likely predator. Oddly herons are not a bird I can recall seeing very often in the vicinity of Eagleton and I suspect that the pond is so close to the house that it might deter any passing heron. Certainly if a heron set it's mind on devouring them they would have little chance. I once saw a heron in Stoke-on-Trent on an island in the middle of a lake. In full view it grabbed a rat, took it into the lake and drowned it and then proceeded to swallow it whole. It was one of the most amazing things I have ever witnessed in nature. The goldfish would hardly even be hors d'oeuvres.
Oddly as I was walking with David and Molly a heron was down on the shore. I was fortunate to get a shot of it when it took off.