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About bedbugs. they sense exactly how and when to best attack their host each night. >> once you go to bed at night and you shut off the light, they can sense the co2 coming out of your mouth and the body heat off your body. that causes them to crawl out of the cracks and crevices. they find a perfectly level spot like on a sheet and they reach forward and they actually just plunk in with a numbing agent and reinsert a second straw to suck the blood. they'll suck on your skin for anywhere from five minutes to fifteen minutes until they're full. and you could have 50 of them on your body and no...

They have an egg they carry around on their rear end. it's about the size of a grain of rice. and it has 14 babies in there. and they drop that off in a nice dark crevice. then those 14 babies hatch within a week or two. then you've got 14. then three weeks, four weeks later, you've got 14 that are having babies times 14. that's how fast it multiplies. in six months you can have well over a million cockroaches if you're not careful. >> after about 20 minutes have passed, the chemical assault that the team has launched takes its toll on the roaches. >> they start dropping off the ceiling and wa...

>> you may not sleep tight knowing this bone-chilling fact about bedbugs. they sense exactly how and when to best attack their host each night. >> once you go to bed at night and you shut off the light, they can sense the co2 coming out of your mouth and the body heat off your body. that causes them to crawl out of the cracks and crevices. they find a perfectly level spot like on a sheet and they reach forward and they actually just plunk in with a numbing agent and reinsert a second straw to suck the blood. they'll suck on your skin for anywhere from five minutes to fifteen minutes until they...

What's providing the fuel, the kindling for the huge fires is the damage caused over a massive area by a small insect. the story tonight from nbc's miguel almaguer. >> reporter: on the front lines of two out-of-control wildfires, no quick end in sight. >> i really don't think the agencies are going to be able to walk away from this entirely until fall. >> reporter: in new mexico, a state of emergency where governor susana martinez said this was an accident waiting to happen. >> just a little bit of wind combined with pine needles that are four feet deep, year after year after year of mismanage...

House. >> it was minutes. i had less than five minutes to get out. >> reporter: some of her neighbors had less time. >> they literally left in their p.j.s. >> reporter: one thing fueling the fires, acres of dead trees killed by mountain pine beatles. the insects reproduce inside the pine bark and have destroyed an estimated $6 billion trees in the western united states and canada. beetles have killed half the trees around tracy defrancesco's house. each tree a virtual matchstick. >> it's brown and dead and it's a roman candle. it goes up. >> reporter: it explodes? >> it explodes. >> reporter: ...