upwards of 4 million (pdf) in 2009. that's a whooole lot of tax dollars ($57 million from the feds, $64 million from states and local gov'ts) going towards dead animals. this site's got the break down.
was anyone else dumbfounded by the total number of birds killed? 2,140,978. someone should forward that number to those anti-feral cat bird brains. their numbers are loose estimates at best, but these are cold rigor-mortis'd facts.
cue *the more you know* music.