Douglas's Ground Squirrel (Otospermophilus douglasii) lives in open grasslands across Western North America. Its conservation status is Least Concern.
Fascinating facts about the Douglas's Ground Squirrel
- Newborn Douglas ground squirrels arrive weighing just 12 g, their skin wrinkled and red, eyes closed and movement uncoordinated. By the fourth week they have sprouted hair, opened eyes and tiptoed around at about 35 g. At seven weeks the youngsters are fully furred, can see clearly and have bulked up to roughly 65 g. By eight weeks they tip the scales at 73 g and are already nibbling solid food. In the wild the longest recorded lifespan stretches to five or six years, showing how a tiny infant can become a resilient adult in less than two months.
- Mating kicks off in western Oregon in late February and runs into early March. Females in northern California typically carry five to six embryos, but larger mothers can pack up to seven, while the smallest may only manage three. Gestation lasts just 25-30 days, and each female usually raises a single litter each year. Pups emerge in May or June and are weaned by mid-July.
- Their underground homes stretch from a shallow 0.3 m down to a deep 3.3 m, with the average tunnel sloping to about 43 cm below the surface. A typical burrow snakes out roughly five metres in length, but some explorers have measured passages as long as 10-14 m and as deep as 84 cm. In productive pasturelands up to 36 entrances can pepper a single hectare, each sometimes crowned by a small dirt mound that doubles as a lookout post. This complex network lets squirrels store food, escape predators and shelter from harsh weather.
- Colonies are heavily skewed toward females, with adult females often twice as numerous as males. Resident males fiercely guard their territories, keeping outsiders at bay season after season. These dominant males also double as sentries, emitting loud chirps that warn the whole group when a hawk or owl swoops overhead. Their ability to distinguish true predators from harmless birds shows the advantage of living in a tight-knit social unit, where every alarm can mean the difference between life and death.
- Genetic studies place the split between Douglas and California ground squirrels at roughly 0.725 million years ago, a timing that matches the birth of the Sacramento and San Joaquin rivers which erected a natural barrier. The IUCN has not yet assigned a formal conservation status, but its close cousin is listed as Least Concern, hinting that the Douglas may share a similarly low extinction risk. Yet their burrowing can undermine roads, levees and building foundations, especially in northern California where tunnels increase seepage and could trigger levee failure.
Sources
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At a glance
RangeWestern North America
HabitatOpen grasslands
DietSeeds and nuts
About the Douglas's Ground Squirrel
In the sun-drenched meadows of the Pacific coast, the Douglas's Ground Squirrel darts with reckless abandon, its tawny fur fluffed against the breeze as it weaves through the tall grasses with an air of joyful urgency. With a twitch of its bushy tail, it freezes, alert to the whispers of the wind, its large, dark eyes drinking in the secrets of its surroundings. As it burrows into the earth, it creates a labyrinthine world of hidden tunnels and chambers, a testament to its remarkable ingenuity and adaptability in this vibrant, thriving landscape.
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