There is a shortage of natural nesting sites, which is thought to be one of the major factors behind the decline of some of our once most common birds'. '.strtoupper('b')y putting up nest boxes, such as this, which replicates a birdaposs natural nesting preferences, you can encourage them to breed near your home'. '.strtoupper('d')ifferent species prefer different nest boxes and our range has been designed by our team of ornithologists to optimum dimensions for the species concerned'. '.strtoupper('l')ook out for regular visitors to your garden and choose a box which best suits their needs'. '.strtoupper('y')ou can check using our hole size guide '. '.strtoupper('t')his nest box, made from wood, is beautifully designed and would be welcomed in any garden. take a look at our other wooden nest boxes'. '.strtoupper('t')his 28mm hole nest box will be used by tree sparrows, blue tits, coal tits, great tits and crested tits.