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Phenology is the study of the timing of natural events, such as when plants bloom or animals migrate.

Nina Leopold-Bradley and her father, Aldo Leopold, kept detailed phenological records in south-central Wisconsin for decades.

The Aldo Leopold Foundation's 2026 phenology calendar highlights Nina's work and the impact of climate change on local wildlife.

BARABOO - I had the privilege of visiting Nina Leopold-Bradley in late 2010 at her home in the Wisconsin River valley near Baraboo.

It was no ordinary interview.

Rather than meet at the nearby Aldo Leopold Foundation office, she insisted I come to her private residence and join her friends and family assembled for the holidays. As Nina, then 93 years old, described it, there were just "20 humans at the table, fi

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