i think the answer to the bird question was that a microbe, which was carried harmlessly by some bird species but had fatal effects for many others, was introduced to the island around the same time as humans... obviously im paraphrasing.. but this is what i got... the others were either convoluted because of timing or they considered the fact that this certain human pop. is the only pop that could have had an influence upon their extinction.
Speaking of changing the answer last minute AND birds, I think I screwed up the Must Be True question about the canary, goose, and ostrich eggs. Anyone remember what answer they put for that? I originally picked A (something about different bird species having different sized eggs) and for some reason changed it to B (something about the bigger the bird, the smaller the egg, which I now realize *can* be true but doesn't have to be). @#$%! Not that A is necessarily the right answer, but then I'd feel extra dumb going from one wrong answer to another wrong one. Stupid bird eggs.