"The River Thames beluga whale has reportedly headed back out to sea after discovering how much it costs to rent a one bed in zone 1", tweeted one user, who couldn't resist using the day's news to take a swipe at London's housing market.
Concerns were growing Wednesday for a beluga whale spotted in the River Thames estuary outside London, thousands of kilometres (miles) from the cherished white species' natural home in Arctic waters.
The RSPCA animal welfare group said it was "working with other agencies to monitor the situation".
Belugas, also known as white whales, are "one of the most familiar and easily distinguishable" of all whales, according to National Geographic.
The video has since been viewed more than 160,000 times, sparking "River Thames" to trend on Twitter.
"Beluga whales are an Arctic species, often seen in groups".
After British Divers Marine Life Rescue were alerted, they confirmed the sighting, noting that the whale seemed to be "swimming strongly".More news: Tiger Woods Takes the Lead at the BMW Championship
The animal was spotted this afternoon near Coalhouse Fort in East Tilbury, Essex.
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.
The Whale and Dolphin Conservation Society said it was "obviously very lost and quite possibly in trouble".
"We would urge that the whale is given space and disturbance is kept to a minimum".
In 2006 an 18ft (5m) northern bottle-nosed whale died after becoming stranded in the Thames.
Belugas, which can grow up to 5.5 metres (18 feet) long, spend most of their time off the coasts of Alaska, Canada and Russian Federation, though they often travel great distances in search of food.