This weekend, Harry Boorman, his cousin Luke and mate (not in the biblical sense) Joe, are scouring the windy streets of London looking for birds. That sentence somehow feels a bit seedy but their endeavour is all above board and in a good cause.
Harry's girlfriend, Hara [pictured right], challenged him to spot 100 different bird species within the M25 over 48 hours. It's more than possible, especially at the moment with so many migrant species here for the summer.
[Saturday Update: They're two thirds of the way there as of midday Saturday - it gets tougher from here on. Cheer them on via Harry's @earlybirder Twitter page]
I wish them luck but also thank them for making so much noise about their escapades. Anyone can have a go and there is so much wildlife to see in London. Once you start looking, you'll find it hard not to stop.
The great thing about looking for birds and other critters is that you suddenly start noticing other wonderful things in the Capital. Our streets, our historic and modern buildings are full of amazing detail and interest, but we rarely find time to actually look at it as we go about the daily business of our lives.
Open your eyes and see what you can discover this weekend.
Good luck lads