the grizzly bear we saw erik wenum tranquilize in the swan mountains may never have seen a human beings it a male or a female? >> wenum: i don't yet. >> whitaker: how long will this grizzly be out? >> wenum: about an hour and... >> whitaker: about an hour. >> wenum: 20 minutes... argh! >> milan vinks: it's a male. >> whitaker: why-- why were you hoping for a female? >> wenum: we want to radio- collar females. females drive the system. they-- they really do. >> vinks and wenum: one, two, three. >> whitaker: will you collar him? >> wenum: we collar some males. we're not going to collar this guy, though. >> whitaker: boy, look at those claws. the forest becomes a field hospital, as they attach monitors and even an oxygen bottle to the grizzly. >> wenum: so he's at 88% oxygen. i like it when it's 90%, 95%, so i want to get him up. >> whitaker: we measured every part of the bear. >> vinks: five and a quarter, okay. >> whitaker: blood is drawn, tufts of hair pulled for d.n.a. analysis. >> wenum: i'm going to call him a five-year-old bear, okay? so you can see, these are his incisors, and if