a virginia opossum. this is just a baby. just a few -- couple weeks old.ar. and this happened a lot. and so the message there is obviously you want to be careful about wildlife, you know, crossing the roads. it can have a big impact. luckily this little guy was saved and one of usually 13 or 14 babies. and this is the only one that was found to survive. the key -- people think they get into your trash can and they will if you leave your trash can open or if you feed your pets outside. don't do that and you'll never have a problem with opossum or raccoon in your backyard. >> his nose is running. >> he needs his mommy to give him a kleenex. >> we do have one more animal that is on the decline as well. this is a wood turtle. >> oh, my gosh. it's swimming. >> this is a northeastern -- it's sort of a semi-aquatic species. these guys are also declining in north america. and they really need our help. they need to us protect woodland and wetland habitats. these guys are found in the northeast and in the great lake states. but check out the beautiful orange color.

there was even an encounter with opossum. researchers said what was surprising is the cat seemed to have another family that let him in to visit. >> that's kind of cool. getting to see what the cat is really doing out there. >> i'm not sure i want to know. that's his business.

opossum. no. keep guessing any animal. fox? got another one with fox. you need one. bear. deer. chipmunk. gopher. woodchuck. groundhog. [ laughter ] keep guessing, guys. wolf. coyote. coyote. you got it with coyote at the last second. whoo! oh, man. the only one you didn't say was skunk, but you didn't need it. you got it with coyote, and you're up to $650. 14 blocks to go. well done, guys. you're up to 650 bucks. from the greek words for beauty and strength, what equipment-free variety of exercise includes both push-ups and crunches. calisthenics? calisthenics. that is correct. and that's good for another 100 bucks. and you're up to $750. that's it for the $100 questions. these next questions are worth 200 bucks a pop, and they're a little harder still. used in firearms but not fine jewelry, fool's gold is a nickname for what common mineral? iron pyrite. pyrite. pyrite is right. you're up to $950. good job. a little bit country and a little bit rock 'n' roll, what pbs show has taped at a university of texas studio since 1976? hmm. i have ideas, but, i mean, it could be -- i'm t

you didn't know if you were looking at a dead opossum or if you were looking at just old food.cognizable. >> they realize that years of dropping food on to the floor had actually created a new higher floor. >> they eat like this and watch the tv and when they are done, they throw this there amend this one that way and it stacks up. >> it's so dense, so packed from, you know, layer, layers, layered, then you walk on it and you layer and you walk on it. it was like walking on a floor. you could pound your fist on it. and you could break your wrist. it wasn't just that area. it was throughout the entire bottom floor. >> in the basement, busted water pipes create a stagnant pool of sludge. >> they had no heat. and as a result the pipes broke. >> we were wearing boots above the knees to get through that stuff because the paper and all the stuff, the clothing and things are absolutely disgusting. >> for 13 days, the team digs their way through the rotting garbage. hardened candle wax and stacks of debris. in total, the crew fills five 20-foot-long dumpsters. >> i didn't think it was