"Data suggests that 2/3 of regional bird species are in decline, 1/3 of those are double digit declines" Friends of the Eel River's Conservation Director Scott Greacen hosts a discussion with Ken Burton, author of Common Birds of Northwest California and A Birding Guide to Humboldt County , about patterns in observational data that may reflect changes in bird populations. In the course of revising his latest edition of Common Birds of Northwest California , Ken compared data from the global