Setting a record

I was doing some tidying yesterday and came across an old copy of 'The Harrier', which is the Suffolk Ornithologist's Group newsletter, dating from September 2008. There is a nice write-up in it by David Walsh of our bird-racing team's record-breaking May bird-race from that year, reproduced below. We had seen 152 species the year before, breaking the previous day-record of 148, and improved upon that total in 2008 by two species, notching up 154 - amazingly, we reached 100 species before 9am, two-and-a-half hours earlier than in 2007. 

I enjoy bird racing, but perhaps January 1st more so than May - the former is a sprint requiring tactics, the latter a marathon requiring stamina; we spent 19 hours 'on-it' in the field in 2008, which was quite exhausting! Nevertheless, it would be nice to have a go at improving on our record - is 160 possible? Maybe in 2014..?