American Pika: The Mountain Mammal That Stores Flowers for Winter

 

What is an American Pika?

The American pika, Ochotona princeps, is a small herbivorous mammal in the family Ochotonidae and the order Lagomorpha, the same order that includes rabbits and hares. It lives in the mountainous regions of western North America, from British Columbia and Alberta in Canada south through the western United States to California, Nevada, Colorado, and New Mexico. Its rounded body, short legs, small round ears, and almost invisible tail give it a compact appearance. The fur is usually grayish brown, helping it blend into broken rock. American pikas live among loose rocks called talus, especially where rocky slopes meet alpine meadows filled with grasses and flowering plants. Unlike rabbits, they do not dig extensive burrows; instead, they shelter in gaps between rocks. They remain active throughout winter, relying on thick fur, shelter beneath the snow, and stores of dried vegetation collected during the warmer months. Their high sensitivity to heat also limits where they can live, making them an important species for understanding changes in mountain environments.

What does an American Pika look like?

An American pika has a round body, short legs, and small rounded ears. Its face is short, with dark eyes and fine whiskers that help it navigate narrow spaces among rocks.

Its coat ranges from gray to brown, with lighter fur on the underside. The color varies with location and season.

The tail is so short that it is barely visible beneath the fur.

At a glance, a pika can look like a tiny guinea pig, but it is a relative of rabbits and hares.

How big is an American Pika?

Adults measure about 18 to 23 cm in body length and weigh roughly 120 to 180 g, although body mass changes with season and population. The National Park Service describes the animal as about 7–8.4 inches long, while Colorado Parks and Wildlife gives a typical weight of about 7 ounces, or 198 g. Differences between published measurements reflect the populations and individuals measured.

Its small size allows it to move quickly through narrow gaps between rocks.

What colors and physical features does an American Pika have?

The fur is gray-brown to reddish brown, often matching the surrounding stone. Its winter coat grows thicker and longer, providing insulation during freezing weather.

Small ears reduce exposed surface area, but the pika is not protected from heat simply because it lives in cold mountains. It is vulnerable to overheating during warm weather.

Its feet are adapted for running across uneven rock rather than digging deep burrows.

Where does the American Pika live?

The American pika lives in western North America. Its range includes the Cascade and Sierra Nevada mountains, the Rocky Mountains, and other mountain systems in the western United States and southwestern Canada.

In the northern part of its range, pikas occur from near sea level to about 3,000 m. In the southern part, they are more commonly found above 2,500 m, where temperatures remain cooler.

Some populations live in unusual rocky habitats, including lava fields and isolated rock outcrops.

What habitat does the American Pika prefer?

American pikas depend on talus, a slope or field of broken rocks with spaces large enough for an animal to hide inside. They often live beside alpine meadows, where grasses and flowering plants grow close to their rocky shelter.

The rocks provide protection from predators and shelter from changing weather. Nearby vegetation supplies food for immediate consumption and for winter storage.

A talus slope without enough edible plants cannot support a pika population for long.

What does an American Pika eat?

The American pika is a herbivore that eats grasses, flowering plants, leaves, sedges, ferns, and other vegetation. It selects food according to nutritional value, including protein, fats, water content, and energy.

Depending on the location, its diet also includes mosses, lichens, shrubs, and conifer needles.

It also eats special soft fecal pellets produced by its digestive system. This behavior, called coprophagy, allows the animal to recover nutrients that were not fully absorbed during the first passage through its gut.

How does an American Pika collect food for winter?

During summer, a pika gathers mouthfuls of fresh vegetation and carries them to a sheltered place among rocks. It spreads the plants out to dry, creating a stored pile called a haypile.

The dried plants provide food during winter, when fresh vegetation is covered by snow or unavailable.

One haypile can contain plant material from dozens of species. The pika also defends its food stores against neighboring pikas that attempt to steal them.

The photograph supplied for this article captures an American pika carrying a mouthful of flowers and grass.

Does the American Pika hibernate?

No. American pikas remain active throughout winter.

They shelter inside rock crevices and move through spaces beneath the snow to reach food stores. Snow cover can insulate their rocky shelter from extremely low air temperatures.

Without stored vegetation, surviving the long alpine winter would be much harder.

How does an American Pika survive cold winters?

The pika has thick insulating fur and a high metabolic rate that helps it maintain body heat. Rock crevices offer protection from wind and direct exposure to cold air.

Snow cover also helps insulate the spaces where pikas shelter. A winter with too little snow can expose them to colder temperatures, while an early spring snowmelt changes the timing of access to vegetation.

Why is the American Pika sensitive to heat?

American pikas are adapted to cool environments and have limited ability to tolerate prolonged heat. Research cited by the National Park Service reports that exposure to temperatures above 28°C for two hours can be fatal under the studied conditions.

They reduce heat exposure by sheltering among rocks and limiting activity during the hottest parts of the day.

In some locations, warmer temperatures force pikas to use cooler microhabitats or occupy higher elevations.

How does an American Pika move?

American pikas run rapidly across rock surfaces, dart between boulders, and disappear into narrow crevices when danger approaches. Their short legs are well suited to quick movement over rough ground.

They do not fly or swim as a regular part of their behavior. Their survival depends heavily on the network of rock gaps around their territory.

Does the American Pika migrate?

American pikas do not undertake regular long-distance migrations. Individuals usually remain within a local territory that contains shelter, feeding sites, and a haypile.

Young pikas establish territories during the summer of their birth. Dispersal between suitable rocky habitats is limited by the distances between patches and the availability of safe routes.

How large is an American Pika's territory?

American pikas defend territories around their rocky shelter and food stores. The National Park Service reports territories of approximately 4,300 square feet in one summary of pika ecology.

Territory size varies with habitat quality, local population density, and the arrangement of vegetation and rock cover. Neighboring individuals defend their own areas, particularly against pikas of the same sex.

What sounds does an American Pika make?

The American pika produces a sharp, high-pitched call that carries across rocky slopes. It also makes shorter sounds described as mews.

Calls can alert nearby pikas to danger or signal the presence of an animal within a territory.

On a quiet mountain slope, a pika's call can reveal its presence before the animal itself is visible.

How does an American Pika communicate?

American pikas communicate through calls, scent marks, and aggressive encounters. They rub their cheeks against rocks and other surfaces, leaving scent from facial glands.

They also use urine and feces to mark areas around their food stores. Intruding pikas can trigger chases or fights.

How does an American Pika reproduce?

American pikas breed in spring, with the timing linked to local snow conditions and elevation. Females can produce two litters during a breeding season, although the second litter has a lower chance of surviving to weaning in many studied populations.

Breeding can begin about one month before snowmelt. The exact timing differs between low-elevation and high-elevation habitats.

How many babies does an American Pika have?

A litter contains about 1 to 6 young, with 2 to 3 common in many high-elevation populations. Newborn pikas weigh around 10 to 12 g.

The young are born with their eyes closed and only a light covering of fur. They remain hidden in a nest while their mother forages.

How long is an American Pika pregnant?

Gestation lasts about 30 days. In low-elevation populations, births can begin as early as March, while births in higher mountain habitats occur later in spring or early summer.

Most young in many populations come from the first litter of the year.

How fast do American Pika babies grow?

Young pikas open their eyes at around 9 days old. They depend on their mother for at least 18 days and are weaned at about 3 to 4 weeks of age.

They grow quickly for small mammals. Juveniles establish territories and begin building their own haypiles during the summer of their birth, but they do not breed until their second summer.

How long does an American Pika live?

The average lifespan in the wild is about 3 to 4 years. The maximum recorded lifespan is about 7 years in both wild and captive settings, according to Animal Diversity Web and other species accounts.

Mortality is high among young pikas, and survival depends on access to suitable shelter, food, and temperatures that remain within their tolerance.

Which animals prey on American Pikas?

Predators include long-tailed weasels, American martens, coyotes, red foxes, bobcats, and birds of prey such as red-tailed hawks and golden eagles. Ravens and other opportunistic predators also take pikas or their young.

Rock crevices provide protection from larger predators, but they do not eliminate the risk from smaller hunters that can enter narrow spaces.

How does an American Pika defend itself?

The pika's main defense is to flee into a rock crevice. Its coat also blends with the surrounding stones, making it harder to spot while it remains still.

Alarm calls warn nearby pikas that a predator is close.

Territorial aggression helps protect access to shelter and food stores from competing pikas.

How does the American Pika affect its ecosystem?

American pikas move plant material from meadows into rocky areas and leave behind haypiles containing vegetation and fecal matter. Some stored material remains uneaten and decomposes, adding organic matter and nutrients to the soil.

Their food gathering links alpine vegetation with the animals that prey on them.

They also provide a useful indicator of environmental conditions in cold mountain habitats.

Does the American Pika damage its habitat?

American pikas do not damage their habitat through ordinary feeding. Their collection and storage of plants changes where some vegetation decomposes and returns nutrients to the soil.

Changes to talus habitat caused by road construction, mining, development, or climate change pose greater concerns than the pika's natural behavior.

Is the American Pika endangered?

The American pika is not listed as globally endangered, but its conservation status differs by jurisdiction and population. Some regional populations are considered vulnerable because of warming temperatures, habitat fragmentation, and limited ability to move between isolated mountain sites.

In the United States, researchers continue monitoring populations to understand how climate conditions affect their distribution and long-term survival.

What are the main threats to American Pikas?

Climate change is a major concern because pikas are sensitive to heat and rely on cool rocky refuges. Reduced winter snowpack can also remove insulation from their shelters.

Habitat fragmentation makes it harder for pikas to move between suitable areas. Mining, roads, and other changes to mountain landscapes can isolate populations.

Local populations have disappeared from some warm or low-elevation sites, although the reasons differ between locations and require site-specific evidence.

What unusual fact makes the American Pika special?

American pikas store plants that are toxic when fresh. Some of the compounds break down during drying and storage, so plants that are avoided during immediate feeding can become part of the winter food supply.

Another unusual feature is that a haypile can contain both food and territorial information: the pile is a valuable resource that the pika defends against its neighbors.

Where was the American Pika photograph taken?

The photograph shows an American pika carrying flowers and grass to build its haypile. Wikimedia Commons records the photograph as taken on 24 July 2016 at Cawridge, Alberta, Canada, by Frédéric Dulude-de Broin.

Photo source: Photo by Frédéric Dulude-de Broin, taken at Cawridge, Alberta, Canada, on 24 July 2016. The image is available through Wikimedia Commons under the Creative Commons Attribution-ShareAlike 4.0 International license.

Sources:

• Animal Diversity Web – American Pika
• U.S. National Park Service – Pikas Resource Brief
• U.S. National Park Service – American Pika
• Washington Department of Fish and Wildlife – American Pika
• Journal of Mammalogy – Conservation Status of American Pikas

Source: Animal Diversity Web