by princeton university press. just fantastic artwork. it is not a fantastic field guide, but the artwork is

princeton university press came down to gw and said i want you to write a book on the collapse and i said, well, sure, i can write a book on the collapse, but you know, what is as interesting is what collapsed? so i said i will write a book about the collapse if you can allow me to write about what collapsed in a large part. it was internationally and globalized and that is why i think it collapsed partly. so the beginning of the become talks about a group that will i will go back and the end is about what might have caused the collapse because to be honest we still don't know. there are a number of possibilities out there and i can go through them and come up with what i think might be the most logical answers but this is 3,000 years ago and ancient history. we are not sure what happened. we came up with it, i wrote it, and he said to me i want to make a book trailer. and i said what is that? and he said it is where you stand up in front of the camera and advertise it like it is a movie coming out. he said, no, no, i have in mind something over the top and this is -- so we got toget

by princeton university press. just fantastic artwork. it is not a fantastic field guide, but the artwork is just glorious. so that -- i will recommend not for the art work and there is a

by princeton university press. just fantastic artwork. it is not a fantastic field guide, but the artwork is just glorious. so that -- i will recommend not for the art work and there is a newer vote -- a new but they came out this year called through birds of north america. published by princeton as well. it covers all of the species recorded in north america that are included in my book. my book covers over 800 species, that leaves out the very barest of the rare, the species that have only been recorded three or four times. so to get information on all of those, there is an excellent new book called rare birds of north america. >> so would you say basically, if i could cannot size you would be most helpful to have your guide about which for the bird watchers says okay, you want to see website things i'm not heard to identify it is such a bird, but the photographic guide also is helpful in that it looks like that. >> yeah, it is helpful to have the photographs. once you think you've identified the bird, look at the photographic guide and