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The deeper entrance hole has been demonstrated to provide highly effective protection from predators such as cats and martins, whilst the design also mimics natural nest sites. The large entrance hole results in a well-lit interior that encourages occupation. A perch below the entrance hole is unnecessary because the birds will happily use the roof of the box. The nesting area is easily accessible by removing the front panel, making it easy to inspect and clean.

Built using wood-concrete; an exceedingly durable, rot-proof and breathable natural material designed to mimic the properties of natural nest sites, the 3SV nest box is available with 3 sizes of entrance holes:

34 mm hole: suitable for tits, redstarts, nuthatches, pied flycatchers, tree sparrows and sometimes even bats.
Oval hole: this will attract the same species as the 34 mm hole, but is recommended when the box is being hung in more shaded areas such as ravines and thick woodland.
45 mm hole: especially intended for starlings although any of the species named may use it. However, they will be ejected if there are any starlings in the vicinity.

For top tips on making your nest box a success, see our blog on Five FAQs About Attracting Birds to Your Nest Box.