<Li> Return to Wild America: A Yearlong Search for the Continent's Natural Soul (2005) by Scott Weidensaul </Li> <Li> The Big Twitch (2005) by Sean Dooley (an Australian "Big Year") </Li> <Li> The Biggest Twitch: Around the World in 4,000 Birds (2010) by Alan Davies and Ruth Miller </Li> <Li> Extreme Birder: One Woman's Big Year (2011) by Lynn E. Barber </Li>

How many species of birds in north america