fever outbreak occurring. Since the brown howlers have such a high mortality rate they are not considered to maintain the virus in their population. Communities that live near the brown howler populations have previously held the belief that the brown howlers were the cause of the disease, and would kill them to stop the spread of disease. In order to protect the brown howlers the local communities should limit their killing and become vaccinated to prevent the disease from spreading. The transmission of yellow fever is through mosquito vectors. In South America the known mosquito vectors of yellow fever are in the genera Haemagogus and Sabethes. In Argentina, the species that has been shown to carry the yellow fever virus (YFV) is Sabethes albiprivis. In 2008-2009 there was a yellow fever outbreak among a brown howler study group in the protected Misiones, El Piñalito Provincial Park. The brown howler is not abundant in Argentina and any outbreak could have a detrimental effect on the population. A group of researchers have created the Brown Howler Conservation Group to continue to study and monitor yellow fever in the brown howler populations. References External links ARKive - images and movies of the brown howling monkey (Alouatta guariba) brown howler Mammals of Argentina Mammals of Brazil Fauna of the Atlantic Forest brown howler Taxa named by Alexander von Humboldt