Wildlife World Blackbird Nest Box This Blackbird nest box mimics open fronted nests that they often choose to stay close to. Blackbirds will love the use of this ledge for nest building because they usually end up building untidy cup shape nests in bushes, hedges or outbuildings. So this nest box will make a perfect home for them during the nesting season. Conceal the nest box with foliage or position out of sight to avoid cats or birds of prey.