The brown pelican fishes by diving headfirst into the water. ... pouch to catch fish and, as the limerick says, its bill does indeed hold more than its ... pelicans are a large bird with short legs, and they appear rather clumsy on land. ... Pelicans must run over the water while beating their big wings and pounding the surface
Sickle cell anemia is persistent in the tropics because those with sickle cell anemia cant contract the malaria virus because of the shape of their blood cells, and this is advantageous in the tropics where there are more malaria cases. So those with sickle cell anemia live to pass on their genes.
