Gerbils originated in the Horn of Africa roughly 10 to 15 million years ago, then spread across the arid regions of Africa and Asia. The pet gerbil you’d find in a store today is almost certainly a Mongolian gerbil, and nearly every one in the United States descends from just nine animals imported in 1954.
An Ancient Lineage From East Africa
Gerbils belong to the subfamily Gerbillinae, the second-largest group within the mouse and rat family. There are 102 known species spread across 14 genera, making them far more diverse than most people realize. Evolutionary evidence points to the Horn of Africa as their ancestral homeland during the Middle Miocene epoch. From there, they dispersed into northern and southern Africa, the Arabian Peninsula, and across western and central Asia.
Today, the highest concentration of gerbil species lives along the coast of northern Africa, particularly in Egypt and Libya, followed by the Sahara-Sahel belt. Species richness drops off the farther east you go into South Asia. Across their full range, gerbils occupy deserts, semi-deserts, steppes, and savannas in eight broad geographic regions stretching from sub-Saharan Africa to eastern Asia.
Where Mongolian Gerbils Live in the Wild
The Mongolian gerbil, the species kept as a pet, is native to the dry grasslands and desert steppes of northern China and Mongolia. Wild populations are concentrated on plateaus like the Ulanqab and Ordos in Inner Mongolia, where the terrain is gently sloping, the vegetation is sparse desert scrub, and temperatures swing dramatically between day and night. The Yellow River acts as a natural geographic barrier between some of these populations.
To cope with these extremes, wild gerbils dig burrow systems that extend between half a meter and a meter and a half underground, where the temperature stays relatively stable regardless of surface conditions. They eat primarily grass seeds, bulbs, leaves, and herbs, drawing most of their water directly from food rather than needing to drink. Their kidneys are specially tuned for arid life: when salt intake is high, their bodies ramp up water reabsorption while flushing excess sodium, a trick most rodents can’t pull off nearly as well. This ability to thrive on minimal water is a defining feature of the entire gerbil subfamily and the reason they’re found almost exclusively in dry habitats.
From Manchuria to American Pet Stores
The domestication story begins in 1935, when 20 pairs of Mongolian gerbils were captured in Manchuria (northeastern China) and brought to Japan for laboratory breeding. They were used in research on parasitic diseases because their small size, clean habits, and ease of handling made them practical lab animals.
In 1954, 11 pairs from that Japanese colony were imported to the United States. Only nine of those animals, five females and four males, successfully bred at Tumblebrook Farm in Massachusetts. That tiny group became the founding stock for virtually all laboratory and pet gerbils in both the United States and Europe. A genetic study published in the Journal of Heredity confirmed what you might expect from such a small starting population: laboratory gerbils have remarkably low genetic variation compared to their wild counterparts.
Gerbils gained popularity as pets through the 1960s and 1970s, largely because of traits that made them appealing in labs. They produce very little urine, which means less odor. They’re social and active during the day. And they’re naturally curious without being particularly prone to biting. All of those qualities trace back to the same desert adaptations that keep wild gerbils alive on the Mongolian steppe.
How Wild and Pet Gerbils Compare
Wild Mongolian gerbils are listed as Least Concern on the IUCN Red List, meaning their populations are stable and widespread across their native range. They’re actually so abundant in parts of China that they’ve been studied as carriers of plague, with outbreaks linked to gerbil populations documented in Inner Mongolia, Ningxia, Shaanxi, and Hebei provinces between 2002 and 2014.
Pet gerbils look nearly identical to their wild ancestors. They’re the same size, roughly 10 to 12 centimeters in body length with a furred tail about the same length. The main difference is color: wild gerbils are sandy brown with lighter bellies, a camouflage pattern called agouti. Captive breeding has produced black, white, slate, and spotted varieties, but the underlying body plan hasn’t changed much in fewer than 90 years of domestication. Their instincts haven’t changed much either. Pet gerbils still dig obsessively, hoard food, and do best when housed in pairs or small groups, all behaviors that mirror life in a burrow system on the steppe.