Dog owners are being warned to keep their pets under control near wildlife after a family of swans were attacked at a lake in Essex.The mother swan - or pen - and two of her cygnets died days after the incident at Northlands Park in Basildon. The injured male swan - or cob - and one remaining cygnet survived and are being cared for at a wildlife hospital.The park warden contacted the RSPCA after the attack by a large dog, which was on a lead but had escaped from its owner."The female swan...
