Yummy! Caddisfly larvae, any chips with that?

I have been keeping an eye on a couple of Water Dipper families that live alongside the burn running through the Hermitage of Braid. The chicks fledged a few days ago but this is the fist time I have been able to get a few decent shots of them being fed. They seem to inhabit the darkest areas of the burn so high ISO's are the only way to get a sharpish image while using a long lens. I hope I did not startle too many dog walkers while I was lurking in the undergrowth.