Did you know that there's a kind of bird that can sew? This bird called the tailor bird uses its mouth as a needle. It sews leaves together in the shape of a cup, then it adds a layer of straw to the inside of the cup and lays its eggs there. Each bird species builds its own special kind of nest. The most common materials used for nests are grasses, branches and feathers. A bird must weave these materials into a nest. Just imagine building a house without cement or nails to hold together. Another bird is called the weaver bird. The weaver bird builds a nest that looks like a basket, the nest is shaped like a pear with a hole in the middle.