Beluga whale spotted in River Thames could be 'in trouble'

A rare beluga whale which has been spotted in the River Thames could be "in trouble," marine wildlife experts have said.Ecologist Dave Andrews first shared video footage of the sea mammal on social media, which he said was swimming in the river off Coalhouse Fort, Essex.Mr Andrews added that the beluga had been feeding around barges on the river for around an hour and had not moved more than 200m in either direction on the river.