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Place a round balloon in a vase, pointing downwards. Mix eight parts glue with one part water and stick strips of newspaper on to the balloon, leaving its neck unpapered. Build up to four or five layers, allowing each layer to dry before applying the next.
When the papier-mâché is dry, burst the balloon and peel it away. Cut the dome in half to make two nest boxes. Discard one if you do not want to use it, or make two.
Make the entrance at the top of the semi-circle by cutting out a semi-circle, 6cm x 2.5cm.
Make the back of the wooden frame by cutting a piece of wood a little wider and deeper than your nest box (ours measured 20cm x 15cm). Centre the hole at the top of the board and secure the nest to the box with two layers of papier-mâchéstrips, inside and out. Allow to dry.
Cut a second length of wood to make the roof, ensuring it extends over the nest. Attach it to the back board using screws.
Paint the nest with a dark, water-based paint and finish with a coat of waterproof PVA glue.