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never seen this thread before, I like the Thames, we've got the certificate from the Conservators for walking the length.Marine mammals thriving in Thames
Ten years of public sightings show that large marine mammals are regularly found in the River Thames.
The Zoological Society of London (ZSL) has received records of 2,732 animals over that period.
Seals were the most common animal seen, with many spotted around London's Canary Wharf, probably because many people spot them from its skyscrapers.
In addition, the public reported 444 porpoises and dolphins on the river, and 49 whales.
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Marine mammals thriving in Thames - BBC News
It was a special day to find this playing around on the south bank not far from the dome