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Adriana Pérez is a general assignment and environment reporter for the Chicago Tribune. Photo taken on Wednesday, Feb. 26, 2025. (Eileen T. Meslar/Chicago Tribune)
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Kristen Boyer and her 3-year-old son, George Boyer, watch as Amelia Gray, a 9-year-old polar bear, swims at Brookfield Zoo on Jan. 8, 2026. (Stacey Wescott/Chicago Tribune)
Kristen Boyer and her 3-year-old son, George Boyer, watch as Amelia Gray, a 9-year-old polar bear, swims at Brookfield Zoo on Jan. 8, 2026. (Stacey Wescott/Chicago Tribune)
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Brookfield Zoo, which has cared for generations of polar bears, hopes to offer guidelines for an area where mothers den at high densities.
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