I was joined by Max for this morning’s session. Max is a professional ecologist who has just moved to Wiltshire. He is keen to set up a raptor box monitoring group in his local area, so I was happy to give him a taster of what it is like in our area.
We started out at the Wiltshire Wildlife Trust property at Clattinger Farm. Ellie, the northern estates manager, when I contacted her to confirm they were happy for me to do the checking, had suggested that I also have a check on the Swallow activity around the farm buildings.
We checked the Owl box and there was a freshly built Stock Dove nest in situ. No sign of adult or eggs, so I will check it again in a month.
Most of the Swallows were busy nest building in the stables. However, one of the nests contained a recently hatched chick and three warm eggs. Again I will check on that in a couple of weeks.
We went from there to Upper Waterhay to check on our four boxes there. There was worse than a complete blank there last year, with the entire brood of Barn Owls predated between first visit and the return to ring them. The other occupied box last year had three well grown Jackdaw chicks, but they were all dead: probably within two weeks of fledging. No idea what killed them. They looked well-developed, just dead.
This year that box also had nestling Jackdaws in it. We ringed the two that were there. Quite young still, just showing their first body feathers and wing feathers short and in pin. These were very well fed, nice full bellies. Hopefully, when we follow up they will have fledged!
One other box was completely empty, but the last box we checked, although we didn’t find an owl in the box, it had a few pellets and, more interestingly, a couple of dead field mice stored in the box. Hopefully this is the start of a nesting attempt. We will check again in a few weeks, fingers crossed.
From there we went over to the Trust’s Blakehill Farm site, where we have two boxes. It was looking like a very disappointing session, especially when you look at our first session of the year. Our first box was another disaster: someone, for some reason, had removed the access hatch door and thrown it on the floor. The box was completely empty.
So one box to go: the one nearest the farm yard. I was hoping we might have something there: it has been 100% successful since I took over monitoring these boxes in 2017. As we approached the box an adult flew off that was a good sign! When I opened the box, oh my goodness: eight chicks at various stages. The smallest was too small to ring but, by the looks of his bulbous stomach, I expect when we visit again in a month it will be ready to go.
The amazing thing is that I have never had a brood of eight before. In fact, prior to this year I had never ringed more than five Barn Owl chicks in a brood. So far this year we have ringed two broods of seven and, now, one brood of eight. We also have three broods to revisit when they have grown a bit. They were all in the six bird bracket.
Max wanted to take some photos, as references for any future monitoring he gets to do. I had the opportunity to show him many of the features we look out for when processing pulli. Obviously, the standard is to weigh the bird. We also make reference to the growth of their wings. These all fell within the category of feathers short, i.e. coming out of pin but less than one-third of their final length. We measure the length of the exposed feather from the top of the pin on primary feather number 4.

One of the first things we noticed was how the flight feathers grow:

If you look at the feather I am holding, there are two feathers growing out of a single pin. This is how the Barn Owl has its silent flight for hunting over fields. The under feather helps deaden the sound coming from the wings when hunting over the fields.
The next thing I could show him was how you can sex Barn Owls based on their wing plumage:

As you can see, even on this partially grown wing, the underwing black spots identify this as a female owlet. If it were a male, it would look like this:

This was our last stop and very much made up for the previous disappointments. On Monday we are off to check out another seven boxes. We know that one of them definitely has a decent sized brood, as the landowner has been monitoring it via a nest cam. It really looks as if we are going to have our best year so far for Barn Owls. Excitingly, they are nesting so early that second broods are very much a possibility this year!
All photos are courtesy of Max.
























