What is thought to be a dolphin or a porpoise has become stranded in the River Parrett in Bridgwater.
Devon and Somerset Fire and Rescue say it got stuck close to the Bristol Channel coastline.
Firefighters launched a rescue effort in conjunction with the RSPCA after being called shortly after 6pm last night.
A DSFR spokesman said: “At this stage it is hoped that with the tide going out that the animal will manage to swim in the right direction back to the sea."
A £2000 reward has been put up by a conservation charity to find the person responsible for the death of a dolphin off the Cornish coast.
Police are continuing to investigate reports that a young dolphin was hit and killed by a speedboat.
Conservationists claim a pod of bottlenose dolphins was surrounded by about 25 small boats in Daymer Bay in the Camel Estuary near Padstow. A carcass was spotted later.
Police are tonight investigating reports that a young dolphin was hit and killed by a speedboat off the Cornish coast.
Conservationists claim a pod of protected bottlenose dolphins was surrounded by about 25 small boats in Daymer Bay in the Camel Estuary near Padstow.
Steve Hardy reports.
Abby Crosby from Cornwall Wildlife Trust says inshore pods of bottlenose dolphins are rare, and to lose one of the mammals is a disaster. She added that they are very intelligent creatures, and the rest of the pod will keenly feel the loss of the calf.
Eyewitness, Carly Daniels, has described how some boat drivers appeared to be ignoring guidelines aimed at protecting marine animals, shortly before the carcass of a dolphin was spotted in the Camel Estuary near Padstow.
A pod of bottlenose dolphins was surrounded by about 25 small boats on Saturday. The mammals are protected under the Wildlife Act, and it's an offence to harass them. A police investigation is underway.
Conservationists have described the death of a dolphin in a Cornish estuary as a 'massive tragedy'. The calf is believed to have been hit by a boat in the water. Abby Crosby from Cornwall Wildlife Trust says boat owners rushed to the scene to try to catch a glimpse of the pod.
Police are investigating after a young dolphin was apparently mown down and killed by boat users in the Camel Estuary in Cornwall. It was part of a rare pod of inshore bottlenose dolphins. It is reported excited powerboat and speedboat users raced to the scene to catch a glimpse of the pod. i
A dolphin turned up during a training session for volunteer RNLI crew members off the Devon coast.
The crew was practising its 'man overboard recovery skills' when the dolphin came in to have a look at what was going on.