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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review of relations between grizzly bears and large herbivores in the Yellowstone Ecosystem based on previously unpublished research.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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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.

Legal Declarations and Congressional Testimonies

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Declaration by Dr. David Mattson for litigation contesting the 2017 removal of ESA protections for Yellowstone grizzly bears

This declaration describes the special nature of Yellowstone grizzly bears and the on-going threats posed by environmental change and management protocols proposed by state management agencies.

Letter by Dr. David Mattson & 72 other scientists to Governor Matt Mead of Wyoming

This letter describes the threats posed to Yellowstone grizzly bears by environmental change and the problematic methods for managing mortality being proposed by the state of Wyoming.

Declaration by Dr. David Mattson for litigation contesting livestock management plans for the Upper Green River area in Wyoming

This declaration describes the threats posed to grizzly bears by US Forest Service plans for managing livestock in the Upper Green River area, with particular emphasis on the problems posed by allowing 72 bears to be killed during the next 10 years.

Testimony submitted by Dr. David Mattson to the Senate Committee on Environment & Public Works

This testimony describes a framework for and approach to promoting coexistence between grizzly bears and people, emphasizing institutions, strategies, and reform of state wildlife management.

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Comments on Government Decision-Making

Comments on the 2016 USFWS Draft Rule to Delist Yellowstone Grizzly Bears

These comments address numerous problems in the Draft Rule related to interpretations of science, the deployed logic, and the invoked science itself. All of these problems amount to fatal flaws  (Dr. David Mattson)

Supplemental comments on the draft 2016 rule to remove ESA protections for Yellowstone grizzly bears

These comments augment those submitted during May of 2016 in response to the US Fish & Wildlife Service's attempts to circumvent legal comment protocols. (Dr. David Mattson)

Comments in response to the USFWS's solicitation of comments on its DPS designation

These comments address the USFWS's extra-legal efforts to circumvent concerns about its efforts to designate the Yellowstone population as a Distinct Population Segiment (DPS). (Dr. David Mattson)

Comments on the Kootenai NF's Black Ram Project draft EIS

These comments address the many short-comings of a draft EIS, since withdrawn, covering impacts of a major proposed timber sale on endangered grizzly bears in the Kootenai National Forest of northwestern Montana. (Dr. David Mattson)

Comments on the AM3 Expansion of the Bull Mountains Coal Mine

These comments address the impacts on grizzly bears likely to be caused by trains hauling coal from the Bull Mountains Mine in eastern Montana. (Dr. David Mattson)

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Objections to the Custer Gallatin NF Revised Forest Plan

These objections address the numerous short-coming related to standards the Custer Gallatin NF Plans for protecting grizzly bears. There is no acknowledgment of impacts caused by non-motorized recreation; major deficiencies in standards that address roads; and lack of habitat protection in areas outside the PCA  (Dr. David Mattson)

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Comments to the Custer Gallatin NF South Plateau Project

These comments cover failings by the Forest Service to adequately address impacts on grizzly bears of a massive proposed timber sale in an area near West Yellowstone that has long been a population sink for bears. Rather than planning to close enough roads to provide the security that bears need to survive, the project instead proposes further harmful impacts. (Dr. David Mattson)

Open Letter to Montana's Governor & Director of FWP

This letter addresses numerous short-coming in both the constitution and implementation of Montana's recently adjourned Grizzly Bear Advisory Council--prominent of which was the politicization of science by the State. (Dr. David Mattson)

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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