The species of crab which is wreaking havoc in the Thames could soon be under control - and in our tummies. Scientists have deemed the river's Chinese mitten crab population fit for human consumption. They believe that catching the pest and selling it in restaurants and shops could be a viable way of controlling its numbers. The crab, named for its bristled claws which resemble mittens, has been colonising the Thames and other rivers around England. It burrows into and destroys fragile riverbanks, preys on other species and competes with native animals such as crayfish. The idea of harvesting the...