Around 16,000 BC, from the Red Sea Hills to the northern Ethiopian Highlands, nuts, grasses and tubers were being collected for food. By 13,000 to 11,000 BC, people began collecting wild grains. This spread to Western Asia, which domesticated its wild grains, wheat and barley. Between 10,000 and 8000 BC, Northeast Africa was cultivating wheat and barley and raising sheep and cattle from Southwest Asia. A wet climatic phase in Africa turned the Ethiopian Highlands into a mountain forest. Omotic speakers domesticated enset around 6500-5500 BC. Around 7000 BC, the settlers of the Ethiopian highlands domesticated donkeys, and by 4000 BC domesticated donkeys had spread to Southwest Asia. Cushitic speakers, partially turning away from cattle herding, domesticated teff and finger millet between 5500 and 3500 BC.