Of course kingfishers aren't actually blue, but are brown... (Which just means the light has to be hitting them the right way for the blue to really shine). Definitely need to be lucky. I was looking for my regular foxes, saw the blue, and usually it'll be some bit of detritus lying in the burn. Something said 'no', which then always becomes a race to get the camera out of the bag quickly enough.
Looking for it later I got fooled into following a Dipper.
@acsimpson, I think that's right. Hoping to update the camera soon, which has the same crop factor, but better resolution.