The aquatic mammal has been spotted several times over the weekend, with the first sighting near Dartford Bridge in Kent on Sunday.
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Today others have seen the sea creature nearby in Erith and around the Ford Factory in Dagenham, east London. Experts believe it is not heading further into the city and is moving with the tide between Woolwich, south east of the capital, and Greenhithe, Kent. They do not believe it has been harmed or ill in anyway, but 'hopes it has just took a wrong turn'. A humpback whale has been spotted swimming in the River Thames on several occasions this weekend.
Boats have been warned to look out for the sea beast to avoid causing it any harm. The sighting comes almost exactly a year after Benny the Beluga whale, who measured around 18ft, was seen in the Thames near Gravesend. Email your pictures to lara.
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We don't think it's ill, it's diving and surfacing pattern is normal for the species. The charity tweeted yesterday: 'We observed the humpback whale in the Thames estuary for just just over 3 hours today, the whale was diving and surfacing at approximately minute intervals, slowly moving down river with the outgoing tide.
Police Constable Dempster, a member of the Metropolitan Police Marine Policing Unit witnessed the sea creature, which in adult form can weigh up to 30 tons, during an overnight patrol.
He tweeted: 'It was spectacular! Was gobsmacked it was so big. Would estimate about 15 meters.
David Callahan, who spotted the whale further along near Rainham, Essex tweeted: 'It looked to be about eight metres long. Just kept on diving.
It's hard to imagine much food for it there. Benny the Beluga was spotted regularly by boat crews and local residents after he first appeared in the water in September.
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He appeared to be happy living around London and Kent, but finally returned to the sea in May after eight months in the area. He had a Twitter account dedicated to him with almost 80 followers, with a local brewery even named a beer after him. Benny even prompted a local council to postpone Bonfire Night celebrations out of fears for his safety.
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Biologists examined the carcass over the weekend during low tide, looking for signs of how the whale might have died, and took samples for a necropsy, the group said. The whale, while about half the length of a full-grown humpback, was too large and in too remote an area to be entirely removed. Emin told G1 that the group hypothesized that the young whale got detached from its mother before it died.
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Humpbacks travel great distances every year, slowly migrating to and from the poles. Those in the Northern Hemisphere migrate this time of year to tropical waters before returning north in the summer. In the Southern Hemisphere, they migrate south during this time of year and return north during their winter, in the breeding season.