The yellow-billed stork is also called the wood stork or wood ibis eat frogs, fish, insects, and small birds and mammals. They lack a voice and communicate by clacking their bills together. They have a fishing technique of using one foot to stir up the water to flush out prey. A quick muscular reflex in the neck enables yellow-billed storks to catch almost all of their food in the water. These storks do not socialize much with one another and tend to isolate themselves in swamps, muddy rivers and marshes. They breed nearly year round. Predators are cheetahs, leopards, lions, and humans The spur-winged geese are the largest African waterfowl and are, on average, the world's largest wild "goose".This bird is often poisonous due to its diet of blister beetles. The poison, cantharidin, is held within the tissue of the fowl resulting in poisoning of those that eat the cooked goose.