On the bird front, the Thames is a feathered metropolis. You’ve got the usual mallards and swans (the Queen technically owns the unmarked ones, but let’s not start that conversation), but also cormorants drying their wings like gothic statues on wooden posts. These birds are such skilled fishers that local anglers both admire and curse them.
Premium Photo | Swan on thames river england
If you’re near the London Wetland Centre in Barnes, keep an eye out for kingfishers—a flash of electric blue that seems too exotic for a city river. They’re shy, so bring binoculars and a quiet patience.
Mammals are a bit more elusive, but they’re there. The water vole, famously known as “Ratty” from The Wind in the Willows, has made a comeback in the leafy upper reaches near Henley. Otters, too—once nearly extinct in England—now slide through the Isis (as the Thames is called in Oxford). Spotting one is considered a badge of honor among local naturalists.
Weird and Wonderful: The Invertebrate Army
Now, let’s get a bit weird. The riverbed is crawling with signal crayfish, an invasive American species that has outcompeted the native white-clawed crayfish. They look like tiny lobsters, and yes, you can eat them (check local regulations first—it’s a gray area). Then there are zebra mussels, tiny striped hitchhikers that have colonized hard surfaces like underwater skyscrapers.
Practical tip: If you walk along the foreshore at low tide—especially around the Millennium Bridge—you’ll find “London’s hidden beach.” London clay there is full of fossilized shark teeth from 50 million years ago. You might not see a living animal, but you’ll touch a ghost of the past.
Thames Estuary Partnership | Digital resources | United Kingdom
