Steppes support a surprisingly rich array of animal life, from massive herds of grazing antelope to burrowing rodents that reshape the soil beneath the grass. Roughly 90 species of mammals alone inhabit the Eurasian steppe zone, with about a third of them found nowhere else on Earth.1Oxford Academic (Journal of Mammalogy). Adaptive Modifications of Behavior in Mammals of The Eurasian Steppes Add in the birds, reptiles, insects, and their counterparts on steppe-like grasslands in Patagonia and North America, and the picture fills out considerably. The open, treeless landscape might look monotonous at first glance, but the animals that live there have evolved striking adaptations to cope with extreme temperatures, drying winds, and the near-total absence of cover.
Large Grazers and the Herds That Define the Steppe
The most iconic steppe animals are the large ungulates. On the Central Asian steppe, the saiga antelope stands out immediately thanks to its bizarre, bulbous nose. That oversized nasal cavity is not just cosmetic. It works as an air-filtration system, allowing the animal to regulate airflow and trap dust particles before they reach the lungs, an adaptation to living in wide-open, windblown terrain.2Journal of Zoology. Case studies in novel narial anatomy: 3. Structure and function of the nasal cavity of saiga (Artiodactyla: Bovidae: Saiga tatarica) Saiga herds once numbered in the millions across Kazakhstan and surrounding countries, though poaching and disease have reduced them dramatically in recent decades.
The Mongolian gazelle is another signature species. Unlike many migratory ungulates that follow predictable seasonal routes, Mongolian gazelles are true nomads. Tracked individuals shifted their summer ranges by 30 to 70 kilometers in a year when vegetation was poorer, and winter ranges for a single animal varied by as much as 340 kilometers between different years.3Journal of Arid Environments. Effects of interannual variations in environmental conditions on seasonal range selection by Mongolian gazelles This wandering is not random. The gazelles are chasing patches of green growth, adjusting where they go based on rainfall and plant productivity rather than returning to the same places each year.4Journal of Arid Environments. Annual movements of Mongolian gazelles: Nomads in the Eastern Steppe That nomadic strategy works well in a landscape where rainfall is patchy and unpredictable, but it also means the gazelles need enormous, unfenced areas to survive.
Przewalski’s horse, the last truly wild horse species, is closely associated with the Mongolian steppe. It went extinct in the wild during the 1960s, surviving only in zoos and breeding programs. Reintroduction projects launched in Mongolia in the early 1990s have slowly built free-ranging populations, though the effort has been complicated by habitat conflicts with livestock and gaps in knowledge about the species’ social behavior.5Conservation Biology. Ungulate Reintroductions: Experiences with the Takhi or Przewalski Horse (Equus ferus przewalskii) in Mongolia Captive breeding and additional reintroduction sites remain active, with several projects still being planned.6PubMed Central. An Update on Status and Conservation of the Przewalski’s Horse (Equus ferus przewalskii): Captive Breeding and Reintroduction Projects
Burrowing Mammals and Why They Matter More Than Their Size Suggests
When there are no trees and few rocks, the ground itself becomes the main source of shelter. Small and mid-sized mammals on the steppe have leaned heavily into burrowing. The steppe marmot digs extensive tunnel networks that reshape the soil, mixing deep and shallow layers, altering nutrient content, and creating distinct patches of vegetation around burrow entrances that differ from the surrounding grassland.7Journal of Arid Environments. Steppe Marmot (Marmota bobak) as ecosystem engineer in arid steppes Many other rodents and lagomorphs, including ground squirrels, pikas, and jerboas, share this burrowing habit. For these animals, underground tunnels serve double duty: they provide protection from predators and they buffer the extreme temperatures that make the open steppe so punishing. Winter surface temperatures on the Central Asian steppe can drop far below freezing, while summer ground temperatures can soar. A burrow a meter or two underground stays comparatively stable.
These burrow systems do not just benefit the animals that dig them. In Mongolia, corsac foxes rely heavily on marmot burrows as daytime resting sites. Tracked corsac foxes used subterranean burrows for shelter about 84% of the time, and more than half of those occasions involved marmot burrows specifically, which the foxes chose significantly more often than other types of burrows.8Oryx. The Endangered Siberian marmot Marmota sibirica as a keystone species? Observations and implications of burrow use by corsac foxes Vulpes corsac in Mongolia Each fox used an average of about seven different burrows, including around four marmot burrows, rotating among them. If marmot populations decline, the foxes and other burrow-dependent species lose critical infrastructure. This is why researchers describe marmots as potential keystone species: their engineering work supports a web of other wildlife.
Herbivorous rodents also affect the steppe through what they eat. Many species stockpile dried plant material underground for winter, a behavior well documented across the zone.1Oxford Academic (Journal of Mammalogy). Adaptive Modifications of Behavior in Mammals of The Eurasian Steppes This hoarding behavior influences which plants dominate an area, since heavy harvesting of certain species shifts competitive dynamics on the surface.
Birds of the Open Grassland
Steppes are home to some of the world’s most impressive grassland birds. The great bustard, one of the heaviest flying birds on Earth, relies on steppe and steppe-like habitats for both breeding and feeding. Females nest in fields of autumn-sown cereals and other low vegetation, making them sensitive to changes in farming practice. In one Hungarian study area within a Natura 2000 site, the spread of center-pivot irrigation systems converted over half the land to irrigated crops, roughly halving the area of autumn cereals that bustards depend on for nesting. The number of females observed in spring dropped sharply as a result.9Ornis Hungarica. Impact of agriculture irrigation on the habitat structure and use by Great Bustards (Otis tarda) in a Natura 2000 site
Raptors also thrive in steppe ecosystems. The steppe eagle patrols the grasslands for rodents and other small prey, and its hunting tactics can be surprisingly sophisticated. Other characteristic steppe birds include the saker falcon, demoiselle crane, and a range of larks and pipits that depend on short grass and bare ground for nesting. Many of these species are considered biome-restricted, meaning they occur primarily in steppe habitats and are therefore vulnerable when those habitats are converted.10Journal of Applied Ecology. Agricultural development and the conservation of avian biodiversity on the Eurasian steppes: a comparison of land‐sparing and land‐sharing approaches
Reptiles, Grasshoppers, and Dung Beetles
The steppe’s smaller residents tend to get overlooked, but they play outsized ecological roles. Grassland vipers, including several species in the genus Vipera, live across European and Central Asian steppes. Their small body size and the total lack of shade make them vulnerable to overheating and dehydration, so they tend to be active during cooler parts of the day and rely on rodent burrows or dense grass tussocks for thermoregulation.11Zoological Journal of the Linnean Society. Voluntary thermal maximum of grassland vipers (Vipera spp.): environmental drivers and local adaptation Steppe tortoises, various lizards, and rat snakes round out the reptile community in warmer parts of the biome.
Invertebrates are arguably the steppe’s most important animal group by sheer ecological impact. Grasshoppers can alter nutrient cycling and plant growth in measurable ways. In long-running experiments at grassland sites, grasshoppers increased nitrogen availability and plant production by up to about 22% and 33%, respectively, at one site, while decreasing both at another. The difference depended on which plant species the grasshoppers preferred to eat: when they fed on slow-decomposing plants, the faster-decomposing species took over and boosted nutrient turnover, and the reverse occurred when the grasshoppers targeted faster-decomposing plants.12Basic and Applied Ecology. Grasshoppers affect grassland ecosystem functioning: Spatial and temporal variation
Dung beetles perform another critical below-ground service. On grazed Mongolian steppe, dung beetles break down livestock dung and redistribute its carbon, nitrogen, and phosphorus into different layers of the soil. Their feeding and tunneling drive nutrients into soil aggregates in patterns that would not occur through simple surface decomposition.13Applied Soil Ecology. Driving forces for aggregate-associated soil C, N, and P from livestock dung and dung beetles in a grazed temperate steppe in Mongolia Without them, nutrient cycling on the grazed steppe would slow considerably.
Steppe Animals Beyond Central Asia
The word “steppe” usually brings Central Asia to mind, but ecologically similar grasslands exist on several continents, each with its own cast of adapted species. In Patagonia, the wind-scoured shrub-steppe is home to the guanaco, a wild relative of the llama and the largest native herbivore in South America. Like Mongolian gazelles, guanacos gravitate toward areas with variable plant productivity, where bursts of green growth offer the best foraging. They also actively avoid areas used by domestic goats and sheep, creating a spatial segregation between wild and domestic grazers that persists year-round.14Journal of Zoology. Including species interactions in resource selection of guanacos and livestock in Northern Patagonia Pumas, Patagonian foxes, rheas, and armadillos fill some of the same ecological niches that wolves, corsac foxes, bustards, and marmots occupy on the Eurasian steppe.
North America’s shortgrass prairies function as another steppe analog. Pronghorn antelope, bison, black-footed ferrets, and prairie dogs occupy roles parallel to their Eurasian counterparts. Prairie dogs, like steppe marmots, are burrowing ecosystem engineers whose colonies create habitat for dozens of other species, including the mountain plover, a shorebird that nests on the bare, closely cropped ground around prairie dog towns. Research in shortgrass steppe has shown that even intensive cattle grazing at twice the recommended stocking rate cannot replicate the bare-soil conditions created by prairie dog colonies or by fire, underscoring how irreplaceable these burrowing species are for habitat structure.15The Journal of Wildlife Management. Disturbance regimes and mountain plover habitat in shortgrass steppe: Large herbivore grazing does not substitute for prairie dog grazing or fire
How Fire and Grazing Shape Which Animals Can Live Where
Steppe ecosystems are not static. Fire, grazing, and their interaction constantly rearrange the habitat mosaic, and different animals depend on different stages of that cycle. After a fire sweeps through, new growth is nutrient-rich and attracts grazers. Those grazers then keep the vegetation short, delaying the buildup of fuel that would carry the next fire. This interplay, sometimes called pyric herbivory, creates a shifting patchwork of tall-grass and short-grass areas across the landscape.16PubMed Central. Collapse and recovery of livestock systems shape fire regimes on the Eurasian steppe: a review of ecosystem and biodiversity implications Some bird species nest only in tall, unburned grass. Others, like the mountain plover, need the nearly bare ground that fire or intensive grazing creates. When either fire or grazing is suppressed across large areas, as happens when steppe is converted to cropland or when pastoral systems collapse, some species lose the specific conditions they need.
Dzuds, Disease, and Other Threats to Steppe Fauna
Steppe animals face dangers that most people outside Central Asia have never heard of. A dzud is a severe winter event, often following a summer drought, in which deep snow, ice crusts, or extreme cold make it impossible for grazing animals to reach food. Livestock mortality on the Mongolian steppe is most strongly linked to winter temperatures, but a preceding summer drought intensifies the effect. When both drought and dzud hit in the same year, average livestock mortality reaches about 18%, considerably higher than in years with either event alone.17Journal of Arid Environments. Livestock responses to droughts and severe winter weather in the Gobi Three Beauty National Park, Mongolia Wild ungulates face the same conditions but without supplemental feeding, which makes dzuds a natural population bottleneck.18Environmental Research Letters. Dzuds, droughts, and livestock mortality in Mongolia
Disease can be even more catastrophic. In 2015, more than 200,000 saiga antelopes, roughly 60% of the global population at the time, died in just three weeks in Kazakhstan. The immediate cause was hemorrhagic septicemia triggered by the bacterium Pasteurella multocida type B, but statistical modeling linked the outbreak to abnormally high humidity and temperature in the days before the die-off. Similar environmental anomalies preceded two earlier mass mortality events in the same region.19PubMed Central. Saigas on the brink: Multidisciplinary analysis of the factors influencing mass mortality events Viral disease crossing from domestic livestock to wild ungulates is another growing concern. During a 2016–2017 outbreak of peste des petits ruminants virus in Mongolia, the virus was detected in saiga antelopes, Siberian ibex, and goitered gazelles, all species sharing rangeland with domestic goats and sheep.20PubMed Central. Molecular epidemiology of peste des petits ruminants virus emergence in critically endangered Mongolian saiga antelope and other wild ungulates
Living Alongside Livestock
Across nearly every steppe region, wild animals share the landscape with domestic herds. This coexistence is sometimes benign and sometimes not. On the Tibetan Plateau’s alpine steppe, the introduction of domestic sheep and goats into an area used by argali (wild mountain sheep) caused the argali to shift to steeper, rockier terrain with less vegetation. The argali also spent about 10% less time foraging, a potentially serious disadvantage during winter when food is already scarce.21Ecological Research. Habitat shift and time budget of the Tibetan argali: the influence of livestock grazing A similar dynamic plays out in Patagonia, where guanacos avoid areas with high densities of goats and sheep, effectively being squeezed into less productive parts of the landscape.14Journal of Zoology. Including species interactions in resource selection of guanacos and livestock in Northern Patagonia
Paradoxically, some steppe species actually benefit from moderate livestock grazing. Heavily grazed grassland supports certain globally threatened and biome-restricted bird species that prefer short vegetation and disturbed ground.10Journal of Applied Ecology. Agricultural development and the conservation of avian biodiversity on the Eurasian steppes: a comparison of land‐sparing and land‐sharing approaches The problem arises when grazing pressure disappears entirely or when grassland is plowed up for crops. After the Soviet Union collapsed, vast areas of steppe cropland were abandoned and began reverting to grassland, temporarily boosting populations of many steppe birds. But recent trends point toward that abandoned land being reclaimed for agriculture, which could reverse those gains.22Biological Conservation. Post-Soviet agricultural change predicts future declines after recent recovery in Eurasian steppe bird populations
Why Steppe Habitats Keep Shrinking
Temperate grasslands, including steppes, have suffered more conversion to cropland, degradation, and fragmentation than almost any other biome on Earth.23Biodiversity and Conservation. Persistent and novel threats to the biodiversity of Kazakhstan’s steppes and semi-deserts In Kazakhstan alone, the “Virgin Lands” campaign of the 1950s and 1960s plowed up tens of millions of hectares of steppe. Even where cropland has been abandoned, recovery is slow, and rising grain prices now drive pressure to plow it again. Research suggests that if agricultural production on the steppe must increase, the least harmful approach is to raise yields on land already under cultivation, through methods like improved grain storage and no-till farming, rather than converting more grassland.10Journal of Applied Ecology. Agricultural development and the conservation of avian biodiversity on the Eurasian steppes: a comparison of land‐sparing and land‐sharing approaches
Infrastructure poses a subtler but growing threat. Roads, fences, railways, and pipelines carve up the open landscape that nomadic species need. For an animal like the Mongolian gazelle, which may wander hundreds of kilometers between seasons, a single border fence can cut off access to entire seasonal ranges. Mining operations, expanding in resource-rich parts of Mongolia and Kazakhstan, add further fragmentation. The result is that even where grassland technically remains intact, the functional connectivity that steppe wildlife depends on is being eroded.
When Bacteria Become a Bigger Threat Than Predators
The 2015 saiga die-off illustrated a vulnerability that applies broadly to steppe wildlife: animals adapted to roam in vast, dense herds are sitting targets for epidemic disease. Pasteurella multocida, the bacterium responsible, normally lives harmlessly in the respiratory tracts of saiga and other ungulates. Under certain environmental conditions, it appears to turn lethal. The 2015 event and at least two earlier mass die-offs all coincided with unusual spikes in humidity and warmth, suggesting that climate shifts could make these events more frequent.19PubMed Central. Saigas on the brink: Multidisciplinary analysis of the factors influencing mass mortality events For a species whose total population can be wiped out by a majority in a single event, any other stressor, including poaching, habitat loss, or livestock disease spillover, becomes magnified. The disease risk makes population recovery unpredictable in a way that complicates conservation planning. Managers have to prepare for the possibility that a population rebuilt over a decade could collapse again in weeks.