The UN's food agency says a three-year drought in southern Madagascar has pushed 1.5 million people into crisis.
The WFP said the number of people in need of assistance had tripled in the past few months.
In the worst-hit area of Amboasary, three-quarters of children have dropped out of school to help their parents look for food.
Some people are exchanging essential household items, such as cooking utensils, for food.
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