The Shoebills (Balaeniceps rex), also called Shoe-billed Storks, or Whale-headed Storks, are very large vertebrate unique birds found in swampy area in tropical east Africa from Sudan to Zambia. They stand about 115 cm (3.5ft) tall, a very large bird indeed. Their weight is 5.6kg (12.3ibs) along with its 2.33-meter-wingspan. Their heads are big in proportion to their bodies, and their bills are thick and wide. Their adults are generally, grey in colour while their juveniles are brown. They feed on lungfish and other aquatic animals in muddy waters. They nest on the ground and the females lay either one to two eggs. While flying, they hold their heads back against their bodies, as do pelicans and herons