Schwegler 1N Deep Nestbox

Birds which nest in recesses or cavities are at risk where there are large numbers of Magpies, Jays, cats and Martins. The 1N has two entrances and a removable wooden insert and offers excellent protection. With two entrances the interior is well lit and birds will readily use it. 

Special case: Robins are particularly attracted to this type of box, especially if it is placed approx. 1.0 to 1.5 m above the ground, preferably in a moist, shady area. The wooden insert, which can be removed for inspection and cleaning purposes, gives protection against predators because nesting takes place at the far end of the box.
It is particularly effective against cats, Martins, Magpies and Jays and therefore makes an effective contribution to breeding success.
 
Exception: Where there is a shortage of suitable nesting areas in parks and forests, this type of box will also be successfully used by all types of tits, Tree and House Sparrows and many other species.