A study that came out yesterday suggesting-- amongst other things-- that the extinction of mammoths and mastodons led to a big shift in plant abundances, reminded me of another good book from a few years back. The ideas in it are mostly speculation, but it is interesting and plausible speculation.
The Ghosts of Evolution:
http://www.amazon.com/Ghosts-Evoluti.../dp/0465005527
http://books.google.com/books?id=7-r...age&q=&f=false
Some of the coverage of the study I mentioned:
http://www.csmonitor.com/2009/1120/p02s13-usgn.html
http://www.msnbc.msn.com/id/34046350...ience-science/