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Technical Reports by the Grizzly Bear Recovery Project

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Grizzly Bears & Ungulates in the Yellowstone Ecosystem

This publication provides a comprehensive review of relations between grizzly bears and large herbivores in the Yellowstone Ecosystem based on previously unpublished research.

For more see here.

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Annual trend grizzly train deaths CY NCD

Effects of Trains & Railways on Grizzly Bears

This technical report reviews research from throughout the Northern Hemisphere on how train and railways affect brown and grizzly bears, with an emphasis on the northern U.S. Rocky Mountains.

For more see here.

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Heart of the Grizzly Bear Nation

This technical report examines the past, present, and future prospects of grizzly bears in the Northern Continental Divide population of Montana, including patterns and drivers of human-bear conflict, environmental change, and the validity of methods and metrics for managing grizzly bear mortality in this ecosystem.

Effects of Pedestrians on

Grizzly Bears

This technical report reviews research from throughout the Northern Hemisphere on how people on foot ("pedestrians") affect grizzly bears, with implications for human safety.

For more see here.

Efficacies & Effects of Sport Hunting on Grizzly Bears

This technical report comprehensively reviews research from throughout the Northern Hemisphere on how sport hunting directly and indirectly affects grizzly bears, human safety, human-bear conflict, and acceptance of bears by people.

For more see here.

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The Grizzly Bear Promised Land

This technical report covers the past, present, and future prospects of grizzly bears in central and north-central Idaho--an area that once had robust grizzly bear populations extirpated by Europeans during the late 1800s and early 1900s, but with the current potential of perhaps supporting 1000 grizzlies.

For more see here.

More Grizzly Times Products & Reports

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Piikani Nation Treaty



Find out everything you ever wanted to know about the biology and ecology of grizzly bears. Authored by world-renowned bear biologist Dr. David Mattson, this site summarizes and synthesizes in beautiful graphic form the science of grizzly bears.


Find out how much Native Americans care about the grizzly bear, with a Grizzly Treaty that has been signed by more than 270 tribes, as well as numerous traditional societies and leaders. The document has become a symbol of international unity in defense of sovereignty, spiritual and religious protection, and treaty rights. 


For an in depth and comprehensive look at the ecology and demography of grizzly bears in the northern US Rocky Mountains, along with all the research relevant to conservation of these bears, see Mostly Natural History of the Northern Rocky Mountains.


GOAL is a coalition of nearly 50 tribes  (and counting) who object to the federal and state plans to delist grizzly bears prematurely and allow trophy

hunting of this sacred being.

GOAL advocates for the tribes'

legal right to meaningful consultation and also for the reconection of tribal peoples to their traditional homelands

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