Tui had been getting nectar from the flowers on the tree it was in. I moved to get a less obstructed view. The movement was detected, resulting in twisting to see, followed by rapid flight away.
I'm pleased with the performance of the Pentax KP. I was using the 55-300 lens (at 300mm), and even so had to enlarge the bird greatly to show what detail is visible. (Best seen large)