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Admission Membership
Admission Membership

Opening weekend for Erb Discovery Trails is expected to be busy May 22–25. Pre-purchased tickets and member reservations are strongly encouraged.  Zoo parking may fill early. Learn More

Grizzly Bear

(Ursus arctos horribilis)

Two brother grizzly bears, Boo and Thor, currently call the Detroit Zoo home.
Boo and Thor — along with their late brother, Mike (2011-2024) — were rescued in 2011 after being orphaned in the Alaskan wild. They later moved to the Detroit Zoo, where they grew and thrived. Today, Boo and Thor enjoy swimming and playing in their expansive habitat.

On Habitat

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Quick Facts

Habitat: American Grassland

Class: Mammals

Conservation Status: Least concern

Size: Up to 10 feet tall when standing upright

Weight: 800 to 1100 pounds

Median life expectancy: 21 years for males; 26 years for females

Diet: Roots, leaves, berries, squirrel, elk, moose and deer