i hitched a ride with misuse of project director bill kleiman and restoration ecologist cody considine to track down the bison in their five hundred acre grazing area. the wire the bison so important to the restoration process bison eight grass and there the disturbances they're creating puts diversity on the landscape as they graze the nutrients are going in one of them is coming out the back and they are getting a very quick nutrient cycling on the prairie. those bison patties are spreading seeds and fertilizing the soil what's the average weight of a full size bison the coyotes can range from eight hundred to eleven hundred pounds in the balls as they mature they can get up to two thousand pounds massive so how many bison do we have on them on the reserve thirty adults and sixteen calves the calf was just born last week a little tiny want to get easily pick it up it's pretty exciting to think about the calf being born a illinois prairie that hasn't happened for probably two hundred years. what happened to bison here there was a tremendous slaughter of bison in the eight hundred seve

project director bill kleiman well you might think that the prairie stude would find its way out into these former corn fields but it doesn't walk very fast so we would have to wait millennia whereas we can collect the seed from the remnant prairie of bring it out to a cornfield that we're retiring planted and it'll grow back year do you have a sense of how many see you in the volunteers here have planted over the years about two hundred fifty species a year so it's it's millions and millions of sea. conventional wisdom was to plant ten pounds of seeds breaker but bill ordered fifty pounds and the fields blossomed none of it would be possible without a core of volunteers like jay stacey. so what are you cutting today this particular for is called per coreopsis scientific name coreopsis paul meta how long have you been doing this i've been doing this is my twenty first year. i'm a prairie bar where. all the tall grass planting was a little too successful. we just needed something that help to level the playing field. what they needed was something to thin out the grass. like an enormou

reporter: 80-year-old bill cosby returns to court monday for his second sexual assault trial in less than a year. >> the trial completely changes. >> cbs news legal analyst rikki kleimanthe me too movement could have an effect on the jury's perception. >> well now me too, now the presumption has totally changed, it's exactly the inverse. we believe that an accusation by a woman, whether or not corroborated, must be truthful. >> reporter: the comedian once known as america's dad is charged in the 2004 alleged drugging and sexual assault of andrea constand. cosby insist it is encounter with constand, a temple university colleague, was consensual. >> the defense is portraying 0 or is going to attempt to portray andrea constand, the accuser, as a greedy woman who was willing to frame bill cosby. >> reporter: for this trial, high profile defense attorney tom mesereau will represent cosby. he is best nope for the acquittal of michael jack soon in the 2005 child molestation case. last week the defense also won a crucial ruling. the judge will allow constand's friend margot jackson to testify about an alleged conversation between the two. miss jackson is going to testify alle