This is the moment a seal was released back into the wild - after being found entangled in netting and nursed back to health.<br /><br />Volunteers for charity Friends of Horsey Seals found the helpless sea mammal on a beach in Great Yarmouth, Norfolk on April 8.<br /><br />They rescued the seal, who they later named Esmeralda, and brought her to the RSPCA's East Winch Wildlife Centre near King's Lynn.<br /><br />There, staff spent "hundreds of hours" caring for her and nursing her back to health - before she was finally released back into the North Sea last week (26/05).<br /><br />In the video, RSPCA staff can be seen walking closely behind Esmeralda as she shuffles across the sand. <br /><br />She then takes a quick look back at those who looked after her, before disappearing off into the sea. <br /><br />Staff at the RSPCA centre near King's Lynn care for dozens of injured seals every year - many who have been tangled up in fishing nets or choked by plastic rings and frisbees.<br /><br />Grey seal numbers in the UK dropped as low as 500 in the early 20th century, but there are now estimated to be around 120,000.