An image of the side view of a buck mule deer, with antlers that have three points on each side,  at golden hour

Mule deer

Odocoileus hemionus

The mule deer is an iconic American ungulate with a black forehead, gray face, brownish-gray body, white rump patch, and small tail with a black tip. The species is named for its large mule-like ears.

Mature mule deer bucks have antlers with main beams that sweep outward and upward, forking once and then forking again. Mature bucks typically have 4 or 5 points on each side, often including brow tines. The antlers are shed and re-grown each year. 

 

The gestation period for pregnant does is 189 to 210 days and typically one or two fawns are born to each doe.  Twins are common in does after their first pregnancy.  Fawns are born in late May through early July.

Phylum:
Chordata
Class:
Mammalia
Order:
Artiodactyla
Family:
Cervidae
Subfamily:
Capreolinae
Genus:
Odocoileus
Species:
hemionus
Statewide Mule Deer Initiative

The Statewide Mule Deer Initiave relies on public involvement to stop the decline of mule deer in Wyoming.

Mule Deer Monitoring Program

The Mule Deer Monitoring program measures the effectiveness of management actions and influences future practices.

Mule deer overview

Learn more about mule deer, their unique characteristics and habitat preferences. Keep reading to expand your knowledge of the mule deer species!

Statewide Mule Deer Initiative 

Mature mule deer bucks have antlers with main beams that sweep outward and upward, forking once and then forking again. Mature bucks typically have 4 or 5 points on each side, often including brow tines. The antlers are shed and re-grown each year. 

 

The gestation period for pregnant does is 189 to 210 days and typically one or two fawns are born to each doe.  Twins are common in does after their first pregnancy.  Fawns are born in late May through early July.

Working Groups

This plan culminates in a series of public meetings held in western Wyoming. This public involvement process and resulting management plan is being developed under the direction of the state's Mule Deer Initiative, a statewide framework designed to address declining mule deer populations. During these meetings, we received feedback on what people in attendance viewed as the biggest issues related to mule deer in the Wyoming Rang and what solutions could be used to address those issues. This feedback formed the basis for the draft plan. If you want more information on the public input process, you can explore this page for presentations and meeting notes.

 

Thanks again for your continued interest in Wyoming's wildlife!

 

Wyoming Range Mule Deer Initiative and Herd Information

Wyoming Mule Deer Initiative
Wyoming Range Mule Deer Plan Final Draft
Mule Deer Executive Summary
Wyoming Range Mule Deer Habitat Management Plan: Big Piney - LaBarge Area
Wyoming Range Mule Deer Herd: History and Current Status
Wyoming Range Hunters' Attitudes Toward Mule Deer Management

In August of 2014, the Wyoming Game and Fish Department (WGFD) implemented the Sheep Mountain Mule Deer Initiative to increase public involvement in the management direction of the Sheep Mountain mule deer herd. Primary goals were to communicate with all interested stakeholders more effectively regarding Sheep Mountain mule deer management and develop a management recommendations document for this herd unit. Recommendations in this document for the Sheep Mountain management are tiered from the statewide Mule Deer Initiative approved by the Wyoming Game and Fish Commission in July 2007. 

 

Management Plan

Sheep Mountain Mule Deer Management Plan

 

Public Meeting

Sheep Mountain Mule Deer Initiative meeting recording

 

Historical Working Group Information

Sheep Mountain Mule Deer Meeting Notes (April 28, 2015)
Sheep Mountain Mule Deer Meeting Notes (May 13, 2015)
Sheep Mountain Mule Deer Workshop Notes
Sheep Mountain Mule Deer Working Group Summary
Annual Meeting UpdateHabitat Happenings
Sheep Mountain Mule Deer Initiative Group Overview
Sheep Mountain Mule Deer Initiative Large Carnivore
Sheep Mountain Mule Deer Initiative Introduction
Sheep Mountain Mule Deer Initiative: Nutrition, Habitat and Monitoring
Sheep Mountain Mule Deer Initiative: Objective Review
Sheep Mountain Mule Deer Working Group Mule Deer Initiative

Working Group Information

Lander/Green Mountain Mule Deer Working Group Charter
Lander/Green Mountain Mule Deer Workshop Notes
Lander/Green Mountain Mule Deer Workshop

 

Working Group Recommendations

Recommendations for the South Wind River and Sweetwater Mule Deer Herd Units-Aug 10, 2015
W
GFD's Implementation Plan for the Lander/Green Mountain Working Group's Recommendations-May 2016

 

South Wind River/ Sweetwater Mule Deer Survey

Survey Results

 

Meeting Presentations

Lander/Green Mountain Mule Deer Update Presentation
Lander/Green Mountain Mule Deer History of Herd Units Presentation
Lander/Green Mountain Mule Deer Habitat Management Presentation
Lander/Green Mountain Mule Deer Hunting Seasons Presentation
Lander/Green Mountain Mule Deer Workshop Presentation

 

Meeting Minutes

Lander/Green Mountain Mule Deer Meeting Minutes (August 10, 2015)
Lander/Green Mountain Mule Deer Meeting Minutes (June 10, 2015)
Lander/Green Mountain Mule Deer Meeting Minutes (April 6, 2015)
Lander/Green Mountain Mule Deer Meeting Minutes (March 16, 2015)
Lander/Green Mountain Mule Deer Meeting Minutes (February 24, 2015)
Lander/Green Mountain Mule Deer Meeting Minutes (February 5, 2015)
Lander/Green Mountain Mule Deer Meeting Minutes (January 26, 2015)
Lander/Green Mountain Mule Deer Meeting Minutes (November 10, 2014)
Lander/Green Mountain Mule Deer Meeting Minutes (October 20, 2014)
Lander/Green Mountain Mule Deer Meeting Minutes (September 2, 2014)
Lander/Green Mountain Mule Deer Meeting Minutes (July 23, 2014)
Lander/Green Mountain Mule Deer Meeting Minutes (June 17, 2014)

Wyoming Game and Fish Department's Mule Deer Working Group Publications

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Laramie Region_Thorne Williams WHMA Mule Deer Capture

Mule Deer Monitoring Program

Challenges + Opportunities

With ongoing population declines, Game and Fish utilizes new technologies and tools to understand declines better, measure the effectiveness of management actions and provide managers and the public with the most accurate information.

View the proposal

State-of-the-art monitoring

public values

Cutting-edge information on harvest and public values

Robust data

Robust data on herd composition

Disease assessment

Disease and nutrition assessments

More information

More reliable information on herd size

immediate information

Access to data that's accurate and immediately available

Movement

Assessments of survival, movement and habitat use

Overview

Learn how this program invests in the future of Wyoming's mule deer.

Mule Deer in Wyoming

Read about the monitoring program at Game in Fish in the September 2023 Wyoming Wildlife magazine.

Focal Herd Updates

Review updates regarding focal herds from the monitoring program.

Mule Deer Overview

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Native or nonnative?

Native

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Wyoming classification

Big game

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Closest relative

White-tailed deer

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Scat

Up to ⅞ inches long, pellet-sized and usually with a dimple in one end.

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Diet

Herbivore

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Top Speed

40 mph

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Terminology

Males are bucks, females are does, young are called fawns and a group of deer is called a herd

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Mule Deer Population Status

Species of least concern

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Lifespan

Typically 9 to 11 years in the wild

Mule deer fun facts

  • Mule deer in western Wyoming migrate over 150 miles seasonally, from the Red Desert to the upper Hoback. This is the longest known mule deer migration in the United States.
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  • Deer are essentially red-green color blind, but see blue and other short-wavelength colors (such as UV light) much better than we do.
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  • Mule deer are known for “Stotting”, a jumping gait of locomotion where all four feet hit the ground at the same time, and all four legs are used in the next jump.
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  • Mule deer's sense of smell is 1,000 times stronger than a human – they can smell a person up to ½ mile away.
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  • Male (buck) mule deer grow new antlers every year.
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  • Mule deer are selective feeders, they must select the most nutritious plants and parts of plants.
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  • These deer get their name from their mule-like ears.
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  • Mule deer antlers are double forked.
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  • Predators of mule deer include bears, mountain lions, coyotes and humans.
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Mule deer track

Tracks

Height: 1-4 inches long

Width of track: .75-2.5 inches 

Stride length: Walking - 13-26 inches | trotting - 29-56 inches

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Mule Deer Sounds

 

Mule deer have slight variations in their vocalizations. They may make Low-pitched vocalizations when not disturbed, snorts of alarm and coughed grunts between males.

Mule Deer Sounds
Audio file
Image
herd of mule deer in Pinedale region

Mule Deer Habitat

Habitat is the primary factor Game and Fish can affect to help mule deer, which is why habitat is central to the Wyoming Mule Deer Initiative. Mule deer prefer plant communities that are in the early stages of succession. Succession is the process by which plant communities change over time. The last 25 years' extensive and severe drought has reduced the quality and quantity of mule deer habitat, resulting in lower survival rates. 

 

Wyoming's shrublands of sagebrush, mountain mahogany, bitterbrush and other woody plants provide mule deer food and cover for protection from predators and the weather. 

 

 

Mule Deer Wyoming Distribution

The mule deer’s native range spans throughout western North America, as far north as the coastal islands of Alaska and as far south as Mexico. In Wyoming, mule deer are found from the lower elevation sagebrush deserts and creek bottoms to above timberline in the mountains. Common habitats range from salt desert shrublands to alpine tundra.

 

Mule Deer Wyoming Population graph

The estimated statewide population of mule deer sits just under 400,000.  Also, the Wyoming Game and Fish Department has increased focus on mule deer conservation through the Mule Deer Initiative, which brings together local stakeholders to develop on the ground actions intended to benefit mule deer in select herds. 

 

Mule Deer Where to find and view

Mule deer can be found in nearly all Wyoming habitats.  Viewing opportunities are likely near Saratoga, Cody, Kemmerer, or Newcastle in the winter/fall timeframe.

Game and Fish conservation/management efforts
WGFC has committed $3,355,210.25 over the last six years towards nine priority Mule Deer Initiative herds. These funds have been matched by outside funding totaling approximately $21,850,611.28. In total, 68 projects have been funded that address either direct habitat challenges or studies that are designated to target future habitat actions. Additionally, in 2022 WGFC contributed $250,000 towards invasive annual grass mapping and management in important habitats. Game and Fish has selected five focal herds (Laramie Mountains, North Bighorns, Upper Shoshone, Sweetwater, and Wyoming Range herd units) to conduct intensive monitoring on. This endeavor will be a long-term effort and will redefine the way WGFD monitors and manages mule deer in Wyoming. The WGFC awarded this effort $2,355,409.00 in June 2022.