Under favourable conditions, the swarms can travel between three and 80 miles or more in a single day.
The FAO said: “Locusts can stay in the air for long periods of time.
“For example, locusts regularly cross the Red Sea, a distance of 300km.
“In the past, there have been some spectacular and very long-distance swarm migrations, for example from North-West Africa to the British Isles in 1954 and from West Africa to the Caribbean, a distance of 5,000km in about ten days in 1988.”
Recently, a number of mature swarms have invaded Eritrea and have spread across the Red Sea coast and highland areas.