Pika

Lore & Background

Pikas are herbivores that feed on grasses, flowers, young stems, forbs, sedges, shrub twigs, moss, and lichens. They digest easily digestible food normally, but for hard-to-digest fiber, they ferment it in the cecum and reingest the resulting soft pellets (cecotropes) to absorb nutrients—a process called cecotrophy, common to all lagomorphs.

Pikas are active during daylight or twilight hours, with higher-elevation species more active during daytime. They do not hibernate; instead, they travel in tunnels under rocks and snow and eat dried plants they have stored. Rock-dwelling pikas use two foraging methods: direct consumption and gathering plants for a haypile. Eurasian pikas often live in family groups and share duties, while North American pikas are asocial outside the breeding season.

Pikas have distinct calls used for individual recognition, predator warnings, territory defense, and attracting mates. Calls vary by season—more frequent songs in spring, short calls in late summer. The large-eared pika of the Himalayas lives at elevations between 2,500 and 5,000 m (8,200–16,400 ft). Changing temperatures have forced some pika populations to restrict their ranges to even higher elevations.

Reader's Guide

Pikas are significant as the smallest members of the lagomorph order, occupying a unique ecological niche in cold, mountainous regions of Asia and North America. Their haying behavior—collecting and storing plant matter for winter—is a key adaptation for survival in harsh environments where they remain active year-round rather than hibernating. This behavior, along with their cecotrophy, allows them to extract maximum nutrition from fibrous plant material.

The impact of human activity on pika habitats has been recorded since the 1970s. When pikas mistake humans for predators, they reduce foraging time, limiting the food they can stockpile for winter. Temperature increases also affect them: for every 1°C rise in ambient temperature, pikas lose 3% of foraging time, as they prefer foraging below 25°C (77°F). This makes them sensitive indicators of climate change in alpine ecosystems.

Taxonomically, pikas are represented by a single extant genus, Ochotona, with 37 species, though many fossil genera are known. The Sardinian pika (genus Prolagus) became extinct within the last 2,000 years due to human activity. Pikas' vocalizations and acoustic characteristics serve as useful taxonomic tools. Their average lifespan in the wild is about seven years, with age determined by adhesion lines on the periosteal bone of the lower jaw.

Did You Know?

• The name pika appears to be derived from the Tungusic word piika, and the scientific name Ochotona comes from the Mongolian word ogotno, meaning 'pika'.
• Pikas have a dental formula of 2.0.3.2 / 1.0.2.3 = 26, and the bottoms of their paws are covered with fur and lack paw pads.
• The Sardinian pika, belonging to the separate genus Prolagus, became extinct within the last 2,000 years due to human activity.
• Pikas do not hibernate; they remain active in winter by traveling in tunnels under rocks and snow and eating stored dried plants.

Taxonomic Identity & Physical Form

Pikas occupy a unique niche within the order of lagomorphs, a group that also encompasses rabbits and hares. Despite their superficial resemblance to these better-known relatives, pikas set themselves apart through their compact, barrel-shaped bodies, stubby limbs, short rounded ears, and the complete absence of an external tail. Their fur lies in a single even coat, and the soles of their feet are covered in hair rather than the padded soles found on other mammals. Body length ranges from roughly fifteen to twenty-three centimeters, with weights between one hundred twenty and three hundred fifty grams, making them the smallest members of the entire lagomorph order. The name pika traces back to the Tungusic word piika, while the scientific genus Ochotona derives from the Mongolian ogotno. Today, thirty-seven living species fall under the single extant genus Ochotona within the family Ochotonidae, though fossil records reveal many more ancient lineages. A separate genus, Prolagus, once included the Sardinian pika, which vanished within the last two millennia as a consequence of human activity. Their dentition follows the formula 2.0.3.21.0.2.3, totaling twenty-six teeth, with gnawing incisors, no canines, and fewer molars than their rabbit cousins.

Alpine & Steppe Habitats

Pikas are creatures of cold, high-altitude environments across Asia and North America. The vast majority cling to rocky mountainsides where countless crevices offer natural shelter, though a handful of species dig crude burrows instead, and a few burrowing lineages inhabit open steppe grasslands. In the mountains of Eurasia, pikas and snowfinches form an unlikely cohabitation, with the birds nesting inside pika burrows. The large-eared pika of the Himalayas and surrounding ranges pushes the boundaries of mammalian altitude, thriving at elevations exceeding six thousand meters. In North America, two species hold distinct territories: the American pika ranges through the mountainous western United States and the far southwestern reaches of Canada, while the collared pika occupies northern British Columbia, the Yukon, western Northwest Territories, and Alaska. Pikas show a clear thermal preference, favoring foraging conditions below twenty-five degrees Celsius and retreating to shaded areas when temperatures climb. Warming climates have already forced some populations to retreat to even higher elevations, compressing their available habitat into ever-narrower alpine bands.

Haying, Digestion & Winter Survival

Pikas are strict herbivores whose diet spans forbs, grasses, sedges, shrub twigs, moss, and lichens. Their digestive system employs a remarkable two-stage process shared across all lagomorphs: easily digestible material passes through and exits as regular feces, while tougher fiber is fermented in the cecum and expelled as soft cecotropes, which the pika reingests to absorb additional nutrients in the small intestine. This behavior, called cecotrophy, is essential for extracting maximum nutrition from a plant-based diet. As autumn approaches, pikas engage in what researchers call haying, pulling grasses, soft twigs, and other vegetation beneath rocks or into protected dens to build a haypile that sustains them through the long, cold winter. They do not hibernate; instead, they remain active by tunneling under snow and rock, feeding on their stored dried plants. Their peak foraging activity occurs just before winter. Notably, collared pikas have been observed storing dead birds in their burrows and consuming the feces of other animals as supplementary winter food. Human presence in tundra ecosystems has been documented since the 1970s to reduce pika foraging time, and each degree Celsius of warming in alpine landscapes costs them roughly three percent of their available foraging period.

Social Life & Vocal Communication

Pikas display a striking contrast in social structure depending on geography. In Eurasia, they commonly form family groups in which members share the duties of gathering food and standing watch, and some species defend territories aggressively. In North America, by contrast, both the American and collared pikas lead solitary lives outside the breeding season. Their vocal repertoire is equally varied. Pikas produce calls of differing lengths—short and quick, moderately drawn out, or long songs—and the short calls exhibit geographic variation. They use sound localization cues to time their vocalizations appropriately. These calls serve multiple purposes: individual recognition, predator warnings, territory defense, and attracting potential mates. Seasonal shifts are clear; songs grow more frequent during the spring breeding period, while late-summer vocalizations shorten. Researchers have found that the acoustic characteristics of these calls can function as a useful taxonomic tool for distinguishing species. When threatened, pikas emit a high-pitched alarm call that earned them the folk name whistling hare. Young are born altricial, with eyes and ears sealed and no fur, after a gestation of twenty-five to thirty days. Rock-dwelling species produce litters of fewer than five, whereas burrowing species tend to have larger litters and breed more often.