Exploring Wildlife At Yellowstone National Park: Know The Mammals, Reptiles, Birds, Fish And More

Nov 11, 2024

Last Updated on: Sep 1, 2025

Travel Blog

The wildlife of Yellowstone National Park is as fascinating as its geology. So, along with the geysers, many tourists also visit this park to explore its wildlife. The grizzly bears, wolves, bison, and more make the park the biggest concentration of mammals in the lower 48 states.

However, the park is also a popular birder hub with ospreys, eagles, and falcons. You just need to know the spots well to encounter these wild creatures, with respect, of course. 

Here, I will give you a brief idea about the mammals, birds, reptiles, amphibians, and fish found in this park. I will also share where to spot them. 

Mammals You Will See At Yellowstone National Park

Mammals You Will See At Yellowstone National Park

May to June or spring is the ideal season for watching mammals at Yellowstone National Park. You will especially get to see many bears and wolves in this season.

Further, at the advent of the fall season, this park has elk bulls in great numbers. 

Moreover, mammals like elk, bulls, and bison are also visible in the park in winter. Winter is also a great time to glimpse the Lamar Valley wolves. So, watching wildlife at Yellowstone National Park is a year-round activity

Tour and Travel Tips For Wildlife Watching At Yellowstone National Park
Trek the park in the early morning or evening to have better visibility of the wildlife. The temperature remains moderate during these hours of the day.
Further, you will need spotting scopes or binoculars to see the wild animals.
Maintain at least 25 yards of distance from elk, bison, and other wild animals. However, for bears and wolves, you must maintain at least 100 yards of distance. 

Let’s learn about the most prominent mammals in the park in detail. 

American Bison

American Bison

Where to Find: Lamar and Hayden Valleys and the Grasslands

Best Time to Find: July to August

Did you know that bison in Yellowstone make up the largest (remaining) bison population on American public land? 

The biggest mammals of the park, bison, have been there since pre-historic times. A male bison weighs 1,800 pounds on average, while the weight of a female bison is close to 1300 pounds. 

Black And Grizzly Bears

Black And Grizzly Bears

Where to Find: Mammoth and Tower Areas (Black Bear) and Lamar and Hayden Valleys (Grizzly Bears)

Best Time to Find: May to June

Black and grizzly bears co-exist in many parts of the national park. Grizzlies are bigger than black bears, with a hump on their shoulders and a rounder face.

Bear safari is a popular activity in the park. However, you need to maintain a distance of at least 100 yards and follow all safety regulations, as bears can get violent, especially when they are with their cubs. 

Elk

Elk

Where to Find: Lamar Valley, Madison Canyon, Mammoth Valley

Best Time to Find: September to November

Due to the impressive antlers, elks are probably the most photographed animals in this national park. Do you know that the antler of an elk can grow up to 6 feet?

Moose and deer, closely related to elks, are other prominent park mammals. Moose is the largest of the Cervidae family, and elks are the second largest. 

Further, moose are seen in the park’s marshy areas and near water bodies.

Bighorn Sheep

Bighorn Sheep

Where to Find: Gardner Canyon and Near the Yellowstone River

Best Time to Visit Bighorn Sheep in Yellowstone National Park – November and December

The large and curved horns of bighorn sheep make them stand out. You will find these horns on the males.

Bighorn sheep live in a herd, and in the fall season, the males get involved in loggerheads to win over their female companion. 

There is one fascinating fact about bighorn sheep. When a baby bighorn sheep (lamb) is born, it can climb and walk within one day.

Wolves

Wolves

Where to Find: Throughout the Park

Best Time to See Wolves: May to June

Around 100 wolves live in the Yellowstone National Park. Leopold packs, Yellowstone Delta, and Slough Creek are the biggest wolf packs in the park. 

Wolves are native to the park. However, in 1995, they were re-introduced here

Along with the types discussed, you will also find mammals like coyotes, martens, red foxes, wolverines, mule deer, marmots, and more in the park. Overall, around 67 species of mammals live here. 

Amphibians In Yellowstone National Park

Amphibians In Yellowstone National Park

Thanks to a unique geology, there are various ponds and wetlands across the Yellowstone National Park. Here, you will find the following varieties.

  • Boreal Chorus Frog
  • Western Tiger Salamander
  • Western Toad
  • Columbia Spotted Frog
  • Plains Spadefoot Toad

Further, these amphibians play a crucial role in the maintenance of the terrestrial and aquatic ecosystems of the park. Many mammals, birds, reptiles, and even fish prey on them. Also, they eat many vertebrate and invertebrate creatures to balance the food chain.

Moreover, the amphibians in the park are indicators of high pollution rates or changes in the weather. They even indicate the advent of diseases and the arrival of any nonnative species. 

So, research on amphibian populations in the park is crucial to know about any impending danger that may affect the ecosystem. 

Reptiles At Yellowstone National Park

Reptiles At Yellowstone National Park

Yellowstone has six species of reptiles. However, there is a greater scope for studying and identifying these reptiles.

As of today, the reptile species found in the park are:

  • Terrestrial garter snake
  • Common garter snake
  • Rubber boa
  • Prairie rattlesnake
  • Bullsnake
  • Sagebrush lizard

Prairie rattlesnake is the only venomous snake in the park, while bullsnake is the largest variety found here.

Yellowstone National Park: A Birder’s Paradise

Yellowstone National Park: A Birder’s Paradise

A 2018 survey in Yellowstone National Park announced the presence of 82 species of birds in the park

Further, the species of birds here are varied, and the table below mentions the variety you will come across in the park.

OwlsNorthern saw-whet owl Northern pygmy-owlBoreal owl Great-horned owl 
EaglesBald eagleGolden eagle
Colony Nesting BirdsPelicanHeronsIbises
Song Birds Ruby-crowned kinglet American RobinDark-eyed junco

You will also find birds like woodpeckers, ducks, geese, swans, falcons, and ospreys in this national park. 

Fish In Yellowstone National Park

Yellowstone National Park is home to many native and non-native fish species. Eastern Brook Trout, brown trout, lake chub, rainbow trout, and lake trout are some non-native fish species in the park.

Further, this park has native fish species, such as mountain sucker, speckled dace, Utah chub, Redside Shiner, etc. 

Human Imprint On Yellowstone National Park 

The home to Native Americans, Yellowstone National Park displays a human tapestry of almost 11000 years. The natives of the place have survived on hunting and fishing. Further, they have known the medicinal properties of the herbs available in the park.

In addition, the healing properties and religious importance of the thermal water here had a major impact on the local human lives. 

Yellowstone National Park: At A Glance 

Yellowstone National Park

How to Reach Yellowstone National Park: Reach the Yellowstone Airport and take a cab or bus to Yellowstone National Park.

Highest Point: Eagle Peak

Established: 1st March 1872

Designation: UNESCO World Heritage Site for “globally unparalleled assemblage of surficial geothermal activity.”

Entry Fee: $25-80 based on the entrance pass 

Visitor Centers: Albright Visitor Center, West Yellowstone Visitor Information Center, Grant Visitor Center, etc. 

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Meet Sibashree Bhattacharya, a travel enthusiast who has a decade-long experience in transcending virtual barriers with her words! Her deep love for travel is apparent from her travel escapades to the mountain, often taking her readers on a journey, her words acting as Portkey! Fun fact: Sibashree loves to dive deep into the history of the places she is about to visit, making her travels even more wholesome. If you were wondering how her articles are not short of time travel, this answers it!

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