The source of it? >> they're actually debating right now, martha. very important question you're asking. they don't know whether it is developing a host in mammals right now but they found it in pigeons. they looked for it in pigs. they haven't found it in pigs. they're tracking birds. as you said they killed all the birds in the area to prevent spread. back in 2005 the last bird flu we were worried about h5n1, that bird flu killed a lot of birds. this one seems to be harboring itself in birds. we're talking birds. you know how many times i mentioned the word bird here? we're not talking about...