Beluga whale stranded in the River Thames

A "very lost" beluga whalespotted in the Thames on Tuesday has been sighted again.

However rescue teams were on standby in case the animal got into danger.

There have only been around 20 sightings of beluga whales off the United Kingdom coast previously (file photo).

Beluga whales are identified by distinctive white markings and are typically found farther north, the Whale and Dolphin Conservation group said.

He said he hoped the whale would find its way home safely, but warned the species also faces threats in its Arctic home, including shipping, oil and gas development and loss of sea ice habitat due to climate change.

The video has since been viewed more than 160,000 times, sparking "River Thames" to trend on Twitter.

The WDC's Danny Groves told the UK Press Association, "He or she is obviously very lost and quite possibly in trouble".

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The network of volunteer "marine mammal medics" said it had whale rescue pontoons at the ready that can be used to re-float stranded animals in an effort to move them to safety.

"The Thames beluga is back feeding in its favoured spot around the barges on the Kent side", he said urging all boats to "keep clear and let it alone".

The last reported sighting of a beluga in United Kingdom waters was in 2015, when two were spotted off the northeast coast of England and one in Northern Ireland.

We would encourage people to look from the land if the whale is still close to the coast.

A female northern bottlenose whale was discovered swimming in the river in central London, going past the Houses of Parliament.

They are common to Alaska, Russia, Canada, and Greenland.

Belugas are able to produce sounds such as chirps, clicks, whistles and squeals, giving them the nickname "the canary of the sea".