A new report into the River Thames health of wildlife has found that a range of sea creatures have lived in the London river - including sharks.
64 years after the Thames was declared biologically dead, research has discovered that venomous sharks have been breeding and living in the river.
It has also revealed that seahorses, seals, and oysters have also been living along the Thames.
The venomous shark is believed to be the Spurdog Shark, which swims in shoals and has two fins that release venom which can cause swelling and extreme discomfort for humans.
Although the Thames was declared biologically dead, the Zoological Society of London has now found 115 species of fish and 92 species of birds across the 600 hectares of saltmarsh.
What did the research find?
The new research has also shown that critically endangered sea creatures are slowly starting to make a comeback.
Those that work on the research hope it will help them build on the future of the Thames and help the creatures found living in the estuaries.
Alison Debney of ZSL said that "Estuaries are one of our neglected and threatened ecosystems.
"This report has enabled us to really look at how far the Thames has come on its journey to recovery since it was declared biologically dead, and in some cases, set baselines to build from in the future."
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