Marine life

Hundreds of baby seahorses released in Sydney Harbour. Video, 00:00:34Hundreds of baby seahorses released in Sydney Harbour

Video shows sea lion leap into fisherman's kayak. Video, 00:00:20Video shows sea lion leap into fisherman's kayak

Pod of dolphins spotted off Welsh coast

The Witness Is a Whale. Video, 52 minutesThe Witness Is a Whale

Rare rainbow sea slug found in rock pool

Sunrise dolphins delight coastal walkers. Video, 00:00:15Sunrise dolphins delight coastal walkers

Walrus Freya killed by Norway gets Oslo sculpture

Angler enjoys rare Channel encounter with whale

'You will be immortalised underwater' Video, 00:02:37'You will be immortalised underwater'

Rowers find record levels of ocean microplastics. Video, 00:01:16Rowers find record levels of ocean microplastics

Man-made rock pools project to boost marine life

Isles anger over plans to protect Scottish waters

BBC Inside Science. Antarctic Ice Special. Audio, 32 minutesBBC Inside Science

Fears of orange harbour link to coal mining

The 'alien' sounds you have probably never heard

The polar sounds you have never heard before. Video, 00:01:18The polar sounds you have never heard before

Robot sailboat invented to forecast weather at sea

Tensions rise over Teesside crab deaths

No suspects sought over Berlin aquarium explosion

Giant hotel aquarium with 1,500 fish explodes

Campaigners call for dredging halt amid probe

Crab deaths to be investigated by independent panel