Mary Tester from BDMLR noted it was 'totally normal' for dolphins near the North Sea but a surprise when they enter London.
The possibility of more wind farms in the North Sea and improved Thames water quality are suggested reasons for the dolphin sightings.
The bends and turns of the river could disrupt the dolphins' echo-location, affecting their navigation.
Jo Jo was last seen heading towards Chelsea, sparking hope after other dolphins previously sighted had died.
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