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Farmers often create their fields by burning an area of its vegetation during the dry season. Only fruit trees or trees useful for animal fodder or firewood are kept, such as baobab, faidherbia, and karita. Crops are planted at the first rains. Traditional farms are laid out in concentric circles centred on the village. These are surrounded by hedges or fences aimed at keeping out livestock. In the Mandara Mountains, these circular plots follow the slope of the mountains in terraces. Virtually nothing grows during the long dry season, so most food must be ground and stored in granaries for use during the rest of the year. Dry season sorghum (Muskwari) is grown along the river banks, relying on the moisture left behind as the rivers recede.