It isn't daft, it's the commonest problem bird photographers have.*
You have an AFS (Auto Focus Single) mode that focuses in the centre part of the photo and that might have helped (if the bird was in the centre ) but when the subject can move it should be better on AFF (flexible area) . The problem is that the next shot is always different so you either chose one or miss shots going from one to the next.
BTW, AFS works on Focus Lock so you can "lock" the focus on the subject (half press the shutter) than recompose the shot so that the subject is not in the middle.
*Just this morning three of us birders where discussing exactly that ; the best setting for birds. The consensus was that there isn't one... (not a universal best...) we had three different cameras but all with multiple focus areas/modes.
I managed to get this quail (centre AF) but completely failed several times getting the flock in flight (they kind of jump a few metres from one spot to the next...) something that I would have had a good chance on multiple zone AF. (I no time to change from one mode to the other...)