Marabou stork,(Leptoptilos crumeniferus) is a large, unusual looking bird. In addition to hollow leg bones, marabou storks have hollow toe bones. In such a large bird, this is an important adaptation for flight. The African Marabou storks reach a wing span of 2,6 metres and a height of 1,5 metres. Marabou storks are bald-headed.