Rhinocycle - two mountain bikes welded together to form a four-wheeled beast - is set to travel the country again.
Croydon Green Party member Andy Lindsay came up with the idea as a way to promote the ancient, threatened animals.
Last year he rode the bike in towns and cities across the UK but this year he is going a bit further.
He said: "I had a really good time doing it with the volunteers last summer. It is hard work but it's character building and the cause is very worthwhile."
The western black rhino was declared extinct in 2006 and there are just four northern white rhinos, less than 50 Javan and 260 Sumatran rhinos left in the world today.
Andy added: "Our rhino will look like a javan rhino because they are on the verge of extinction and people need to take action now. This trip is about raising awareness and asking people if they can really let them go extinct without doing anything."
The cycle begins in London on June 16 and arrives in Edinburgh on July 8, with volunteers welcome to pedal alongside Andy anywhere along the route. To find out more contact Andy on 07939 035109 or email him at jock.lindsay1@tiscali.co.uk.
If you're not keen on doing the cycling part, you can still help by sponsoring Andy at justgiving.com/rhinocycle007.
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