. >> tracking those movements with the gps collars is julia brockman a bison researcher at southern illinois university. >> what kind of data are you receiving? >> so we're getting location information, a gps point on a map every hour, 24 hours a day. >> so can you show me what you've been seeing? >> sure. these are the bison locations for yesterday they seemed to be spending a lot of time along their corral and trap pasture. and i can corroborate that because we were there and i saw them there. >> and what would you say is the ultimate goal of your study? >> having that amount of data really changes how we look at their movements and their selection. it helps to understand what type of habitat they'll like for reintroductions in the future. >> among the 2 dozen scientists doing research at nachusa, is doctor holly jones, a conservation biologist at northern illinois university. with her team, she's trapping and tagging small mammals to assess the impact of the big bison. >> so its completely a restoration ecologists playground. i get so excited about this field site. let's see if someone is