BBC News has an article that is an excellent example of how localized crises can have international effects. Large numbers of red-billed Queleas (Quelea quelea), one of the most largest bird species in the world, have been attacking crops in northern Nigeria.
State and local officials say more than 8,000 hectares of crops - mainly millet - has been destroyed, with tens of thousands of peasant farmers affected."The birds are migratory; most of them came from Niger where they could not find food to eat," agriculture official Tukur Maru said.