Surprised Londoners have captured video of them swimming in the river near Canary Wharf in east London. They were also spotted by the Thames Barrier, and in the river at Greenwich.
Dolphins are a rare sight in the Thames. In 2017 a cetacean - thought to be a porpoise, but which was nicknamed the Thames dolphin' - made headlines when it swam more than 40 miles inland to west London.
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