Your pictures: Transport

Cliff Rossenrode: "A grey heron takes a ride on a hippo wading in a dam of Kruger Park, South Africa."

Lauren Rogers: "On a beautifully peaceful walk along an unused train track in the Staffordshire moorlands we came across this rather lovely train."

Jack Appleton: "Abandoned - my daughter's old toy car kicking about the garden."

Sunil Pareek: "Not in the core deserts, but in the area nearby to the population, a camel cart is one of the most useful and popular modes of transportation."

Phil Mills: "Airlines are always seeking to become more efficient. No frills means no frills, even for the pilots, as do-it-yourself window cleaning comes in."

Holly Stranks photographed a Caterham 7 during a track day at Snetterton Race Track, in Norfolk.

Brian Anderson: "RNLI dinghy pencils and pencil-tops on sale at Staithes and Runswick lifeboat station[, North Yorkshire]."

Dasa Wharton: "Transporting the tourists to the Amber Fort, in Jaipur, India."

Richard Poulton: " I was lucky enough to blag a ride on one of the many balloons flying over Canberra for the balloon spectacular which takes place every year. I was hoping to get a shot of the balloons flying over Canberra’s Lake Burley Griffin - but, due to the weather conditions, the launch site was moved. So, instead of the lake, I got the newly built suburbs."

John Swinburne: "During high tides, sea water enters through special openings and floods the cobbled streets of the old historic quarter of Paraty in Brazil. For a short time, this water can be up to 1ft (30cm) deep, and the driest transport around is to take a horse and carriage. The rider of this 'water cycle' will no doubt have had wet feet."

Alex Mitchell: "Ant Burgess doing back flips on his ski [scooter] at Bolesworth International Horse Show 2015."

Darryn Cleare: "Whilst hunting for some street art in Riga, Latvia, I came across some kids drawing their own street art in chalk."

And, finally, a picture by Steven Reid, who called it Zooming through the London Underground. The next theme is "dance" and the deadline for your entries is 20 September. If you would like to enter, send your pictures to yourpics@bbc.co.uk. Further details and terms can be found by following the link to "We set the theme; you take the pictures" at the bottom of the page.