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I've just learned there's a job called mammal preparator. this is a job done by dr. anna goldman. and it's performed right here at chicago's field museum. >> this is the mammals prep lab. this is an example of what we do. these are are studied skins. tan skins. you're actually going to be making one of these today. >> why? >> what we're trying to is track change over time. we want to have our finger on the pulse of the environment. >> well, to ask, like, the screamingly obvious, why, why is it important to track populations and all of that over time? why do we care so deeply about that? >> so,...

I've just learned there's a job called mammal preparator. this is a job done by dr. anna goldman. and it's performed right here at chicago's field museum. >> this is the mammals prep lab. this is an example of what we do. these are are studied skins. tan skins. you're actually going to be making one of these today. >> why? >> what we're trying to is track change over time. we want to have our finger on the pulse of the environment. >> well, to ask, like, the screamingly obvious, why, why is it important to track populations and all of that over time? why do we care so deeply about that? >> so,...

Wasn't as heavily used after the mid '80s is because they found out it was one of the leading causes of the bald eagle decline and found this by looking at egg shells from the early 1900s and comparing them to egg shells in the 1980s and they found out that ddt actually resonates in these egg shells and makes them thinner. therefore, there's less survival rate of their chicks. >> that's an excellent answer. >> so these are my volunteers and interns. they give me their free time. >> yeah. >> and i put them through hell. >> every day. >> both squirrels, position of surprise. >> this is a female ...

Mid 1980s and the reason why it wasn't as heavily used after the mid '80s is because they found out it was one of the leading causes of the bald eagle decline and found this by looking at egg shells from the early 1900s and comparing them to egg shells in the 1980s and they found out that ddt actually resonates in these egg shells and makes them thinner. therefore, there's less survival rate of their chicks. >> that's an excellent answer. >> so these are my volunteers and interns. they give me their free time. >> yeah. >> and i put them through hell. >> every day. >> both squirrels, position o...

You. for the people that react to the bites which is only 20% of people, they literally go crazy. i mean were they're constantly itching. they know they have bugs. they're embarrassed. you almost need some type of counseling besides extermination just to get through your everyday life until the problem is gone. >> the staff uses cameras to record some of their most extreme cases. and there are many. if you think you're hearing more stories about bedbugs lately, you're right. >> you talk to anybody that's 80 years or older, they'll remember bedbugs in the united states. but they just became a c...