Experts estimate that 100 million locusts swarmed over the Canary Islands in November. The locusts, nicknamed 'sky prawns' have invaded Fuerteventura and Lanzarote, the worst incidence in over 50 years. The desert locusts flew to the Canaries across the 60 miles of ocean from North Africa, where an infestation this summer wreaked havoc on crops. The insects, around 2.5 in long and two grams in weight, can travel twice that far in 24 hours. A 40 million swarm can eat 40,000 tons of vegetation a day.