BARN OWL NEST BOXES

Let's say you have a piece of land in mind and you are thinking of providing a nestbox for Barn Owls. What type of box would be best? Should you go for a box in a building, in a tree, or on a pole? The success of your nestbox will depend to a large extent on making the right choice so here's a brief guide...
If there's a large building that a Barn Owl can enter at 3+ metres (10') above the ground then this is almost certainly the best place to put the new nestbox. Boxes in buildings are easier to erect, cheaper to obtain (cheaper and quicker to make), they last a lot longer, and the extra shelter afforded by the building will benefit the owls. If there's a building with no access, can a small owl hole be made? Mounting a box on the outside of a building is an option but it has many disadvantages and cutting holes in timber, asbestos sheet, metal sheet, or even knocking a hole through a brick or block-built wall is not as hard as you may think. Buildings that are in human or agricultural use are usually very suitable as Barn Owls can get used to almost any kind of activity as long as they can stay out of sight.

If there's no building at least 3 metres high or none accessible by Barn Owls then a tree box is generally the next-best option. Tree boxes are more expensive to obtain and more difficult to erect than indoor boxes, they don't last as long, and the owls won't have much shelter. There's also a greater chance of occupation by some other species. However, (provided that you have a suitable tree in a suitable position) they are a much more practical option than a pole box.

Pole boxes are the least preferred option. They are by far the most expensive (because they are larger and more time-consuming to build), they are the hardest to erect, they don't last anything like as long as boxes in buildings, and the owls are completely exposed to the elements. Many pole boxes are also very unsafe for emerging young owls. After its first flight (or fall), any fledgling owl that is unable to fly back up to the box stands little chance of survival. The only major advantage of the pole box is that it can be provided almost anywhere (you are not dependant on there being a suitable building or tree on-site). The poles need to be very substantial and generally need to be erected by machine - the costs are considerable. Pole boxes are only cost effective where there is good foraging habitat but no suitable buildings or trees for boxes to be placed in. The Barn Owl Trusts new Pole-box design maximises nest safety for the emerging young.

Apart from deciding where to put your new nestbox, getting the best nestbox also means choosing the best design and when it comes to design, the old adage "you get what you pay for" does NOT apply. There are some very costly badly designed boxes on the market! The Barn Owl Trust receives numerous calls every year from people who've found a fallen owlet and in many of these cases a poorly-designed nestbox was to blame. Our Nest Boxes have been approved by and designed with RSPCB and the Barn Owl Trust.

Nestboxes that have the nest place and entrance hole on the same level allow owlets to fall out easily and owlets that are not in the nest generally starve to death or are taken by foxes. Some types of tree box have a low entrance hole and these are only useful if erected WITHIN THE BRANCHES of a suitable tree. In this way owlets are less likely to fall to the ground and any that do stand a good chance of being able to climb back in. Nestboxes with a drop of less then 25cm (10") from the bottom of the hole to the bottom of the box are not much better than all-on-one-level boxes. In 2008 we decided to stop using (and stop providing information on) Barn Owl nestboxes with low entrance holes. They are just not safe enough.

P.S. Don't forget that the owl's food supply has a MASSIVE influence on occupation, survival and breeding success. Check out our pages on the creation and management of optimum habitat - rough tussocky grassland with a permanent litter-layer...

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