Yellowstone Up Close and Personal Logo © Copyright Page Makers, LLC
Yellowstone Up Close and Personal Grizzly Logo © Copyright Page Makers, LLC

Yellow-bellied Marmot (Marmota flaviventris)
Yellowstone National Park

Phylum Class Order Family Genus Subgenus Species
Chordata Mammalia Rodentia Sciuridae Marmota Petromarmota Marmota flaviventris

Yellow-bellied Marmot in Yellowstone National Park by John William Uhler © Copyright All Rights Reserved

Yellow-bellied Marmot (Marmota flaviventris)


• 20–28 inches long; 3.5–11 pounds
• One of the largest rodents in Yellowstone
• Reddish-brown upper body; yellowish belly; small ears; prominent active tail.


• Found from lowest valleys to alpine tundra, usually in open grassy communities and almost always near rocks.
• Feed on grasses and forbs in early summer; switch to seeds in late summer, occasionally will eat insects.
• Preyed on by coyotes, grizzlies, and golden eagle.


• Hibernate up to 8 months, emerging from February to May depending on elevation; may estivate in June in response to dry conditions and lack of green vegetation and reappear in late summer.
• Breed within two weeks of emerging from hibernation; average 5 young per year.
• Active in morning, late afternoon, and evening.
• Colonies consist of one male, several females, plus young of the year.
• Vocalizations include a loud whistle (early settlers called them "whistle pigs"), a "scream" used for fear and excitement; a quiet tooth chatter that may be a threat.
• Males are territorial; dominance and aggressiveness demonstrated by waving tail slowly back and forth.

Information provided by Yellowstone National Park (NPS).

Yellow-bellied Marmot

Yellow-bellied Marmot in Yellowstone National Park by John William Uhler © Copyright All Rights Reserved Yellow-bellied Marmot in Yellowstone National Park by John William Uhler © Copyright All Rights Reserved

Yellowstone National Park by Page Makers, LLC © Copyright All Rights Reserved
I n d e x
Accessibility Earthquakes Maps Video Page
Address Email Newspaper Visitor Centers
Adult Programs Entrances Old Faithful Live WebCam Visitor Stats
Amphibians Entrance Fees Pets Volcano Observatory
Animals Fall Closure Phone Numbers Waterfalls
Backcountry Fish Picnic Areas Weather
Bear Management Fishing Fees Ranger Led Activities WebCams
Bear Sightings Fishing Regulations Reptiles Wildflowers
Biking Getting Here Reunions Winter Closing
Boating Hiking Rivers, Creeks & Streams Winter Opening
Books History Roads Winter Weather Reports
Butterflies Junior Ranger Program Schedule Wolf Project
Camping Lakes Search Page Wolf Sightings
Campground Maps Location Spring Opening Wolverine Help
Challenges Lodging Star Talks Yellowstone ~ the Name
Chat Page Lynx Help Trip Planner pdf Young Scientist
Clinics / Medical Mammal List Trip Reports Youth Conservation Corps

Yellowstone National Park WebCams
Old Faithful Live All Old Faithful Old Faithful Static Old Faithful VC North Entrance Mt Washburn Mammoth YVO WebCam

Entrance Cities and Gateway Towns
Gardiner, Montana Silver Gate, Montana West Yellowstone, Montana Cooke City, Montana
Livingston, Montana Cody, Wyoming Jackson Hole, Wyoming Yellowstone National Park

Not all who wander are lost by John Ronald Reuel Tolkien © Page Makers, LLC

The Great Outdoors Net Great Outdoor Recreational Places
Gardiner, Montana World Humanity

Contact Us

by John William Uhler

Back to: Yellowstone Up Close and Personal

Copyright © 1995 - 2014 Page Makers, LLC and Yellowstone Media ~ All Rights Reserved