Donors at Brookfield Zoo Chicago blood drive Wednesday get free admission amid supply crisisThe Brookfield Zoo Chicago is hoping to make a dent in the Red Cross blood crisis. The Brookfield Zoo Chicago is hoping to make a dent in the Red Cross blood crisis. The Brookfield Zoo Chicago is hoping to make a dent in the Red Cross blood crisis. The Brookfield Zoo Chicago is hoping to make a dent in the Red Cross blood crisis. BROOKFIELD, Ill. (WLS) -- The Brookfield Zoo Chicago is hoping to make a dent in the Red Cross blood crisis.