Mastromonaco works with more than 50 species a year, but the focus of her keystone projects is with the Toronto Zoo's wood bison, a near-threatened species.

Minnesota bison. Bison numbers in North America were estimated to have been between 30 million and 60 million animals before they were nearly exterminated in the 1800s.

Gabriela Mastromonaco, reproductive scientist and senior director of wildlife science at the Toronto Zoo is a nominee for the 2025 Indianapolis Prize. (Toronto Zoo) Mastromonaco works with more than ...