Category: Mammals

Western Gray Squirrel  (Sciurus griseus)

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The Western Gray Squirrel (Sciurus griseus) is a tree squirrel species native to the western United States. Known for its striking appearance and arboreal lifestyle, this species plays a significant ecological role in its habitat.

Western Gray Squirrel  (Sciurus griseus) enjoying a peanut in the San Bernardino Mountains, California
Western Gray Squirrel  (Sciurus griseus) enjoying a peanut in the San Bernardino Mountains, California

Description

The Western Gray Squirrel displays notable characteristics in its appearance and behavior.

  • Size and Coloration: Adults typically measure between 46 to 61 centimeters (18 to 24 inches) in length, including their bushy tail, which comprises about half of their total length. They weigh between 400 to 700 grams (14 to 25 ounces). The coloration of their fur varies geographically but generally includes shades of gray, with white underparts and a distinctive white fringe on their tails.
  • Habitat and Range: Western Gray Squirrels inhabit a variety of forested habitats, including mixed coniferous forests, oak woodlands, and riparian areas. Their range extends from Washington and Oregon through California and into parts of Nevada.
  • Behavior: These squirrels are primarily arboreal, spending much of their time in trees. They are agile climbers, using their strong hind limbs and sharp claws to navigate branches with ease. They build nests, called dreys, out of twigs and leaves in the canopy for shelter and raising young.

Diet

The Western Gray Squirrel is omnivorous, with a diet consisting of a diverse array of food items.

  • Vegetation: They feed on a variety of nuts, seeds, fruits, berries, and acorns. Oak trees are particularly important food sources, and these squirrels play a role in seed dispersal and forest regeneration by caching and forgetting seeds.
  • Insects: In addition to plant matter, they also consume insects, bird eggs, and small vertebrates, supplementing their diet with protein-rich prey.

Range

Reproduction

Breeding typically occurs from late winter to early spring, with females giving birth to one to six young, though litter sizes usually range from two to three. The gestation period lasts approximately 36 to 40 days. The young are born hairless and helpless, relying on their mother for warmth and nourishment until they are weaned at around 10 to 12 weeks of age.

Conservation Status

The Western Gray Squirrel faces several threats to its populations, primarily due to habitat loss and fragmentation, as well as competition and predation from invasive species such as the Eastern Gray Squirrel (Sciurus carolinensis). Additionally, urbanization, logging, and wildfires have further impacted their habitat and population dynamics. While specific conservation efforts vary across their range, maintaining and restoring suitable habitat and implementing measures to mitigate human-wildlife conflicts are essential for the long-term survival of this species.

The Western Gray Squirrel is a charismatic and ecologically important species in western North American forests. Understanding its biology, behavior, and conservation needs is crucial for preserving its populations and ensuring the health of forest ecosystems where it resides. Continued research and conservation efforts are necessary to address the various threats facing this iconic tree squirrel species.

Classification

KingdomAnimalia
PhylumChordata
ClassChordata
OrderMammalia
FamilyRodentia
GenusSciurus
Speciesgriseus

References

Wild Burrow ( Equus africanus asinus )

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Scattered across the south west scattered small populations of Wild Burrow ( Equus africanus asinus ) thrive in the harsh landscape. The burrow is also known as a donkey, wild ass. The animal is first first brought to the desert southwest by the spanish explorers in the 1500’s as pack animals. The humble burrow help haul goods and open the west. The burrow populations across the desert are the result of escapes, abandoned animals or stranded by the death of their owners.

Wild Burrow photographed in Beatty, Nevada - Photo by James L Rathbun
Wild Burrow photographed in Beatty, Nevada – Photo by James L Rathbun

This animal, which was originally found in Africa and later domesticated, is well suited to the dry desert landscape. The frame of the animal is short of ruffed, standing about four and half feet tall and weighing about 350 pounds. The long ears and short manes are a well defined feature of this beast of burden.

"Wanderers of the Wastelands" vintage postcard of an unknown prospector and his burros. | Courtesy of Orange County Archives.
“Wanderers of the Wastelands” vintage postcard of an unknown prospector and his burros. | Courtesy of Orange County Archives.

Today, all across the desert, the little burrow can be seen in a variety of locations including, Mountain Pass California, Beatty Nevada, and Oatman Arizona. The great state of Nevada established the Marietta Wild Burro Range. The Marietta Wild Burro Range sets aside 68,000 acres. The range is managed principally, but not exclusively for the population of 100 or so, burrow in the area. The burros freely roam near the ruins of the historic Nevada mining town of Marietta.

It is not uncommon for them to approach people looking for hand outs. It is a common practice to pass laws prohibiting the feeding of burrow.

Classification

Kingdom:Animalia
Phylum:Chordata
Class:Mammalia
Order:Perissodactyla
Family:Equidae
Genus:Equus
Species:E. africanus
Subspecies:E. a. asinus

References

Pronghorn ( Antilocapra americana )

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A solitary Pronghorn ( Antilocapra americana ) found near Golbin Valley, Utah
A solitary Pronghorn ( Antilocapra americana ) found near Golbin Valley, Utah

Commonly known as an antelope, the Pronghorn ( Antilocapra americana ) is an even toed or hoofed mammal found in the plains of the western United States of America. The Pronghorn in america is mislabeled as an antelope, which is an old world or African species of Antelope. The Latin name, Antilocapra americana means “American goat-antelope”

The Pronghorn lives in brush and grass lands and deserts and survive by grazing on the vegetation. They typically live in herds which may number in the hundreds depending on time of year and food sources.

They have excellent eye sight use this valuable resource to keep a distance from predators in the wide open habitats they are found. They are also the fastest animal in the western hemisphere and can run at speeds up to 60 miles per hour. The result is a reclusive animals that tends to run when it sees any threat, which means these animals can be difficult to get near. Typically, when I see them in the field, it is their white hind quarters travelling at a high rate of speed away from me.

Males typically stand between 51 and 59 inches in height and weigh between 88 and 143 pounds. The female are about the same height, however, more slight at 75 to 106 pounds. Their coloring is quite distinctive and features large white patches on the rumps, belly and heads with black bands on the face and necks. They boast large eyes located towards the tops of their skulls which have a field of view of 320 degrees. This feature allows the animals to maintain distance and allows them to spot predators while resting in the tall grass.

Cougers, Coyotes, Wolfs and Bob Cats are known to prey on the pronghorn. Additionally, they were a valuable food source for many Native American tribes including the Assiniboine, Rapid and Blackfoot Tribes.

Resources

Classification

Kingdom:Animalia
Phylum:Chordata
Class:Mammalia
Order:Artiodactyla
Family:Antilocapridae
Subfamily:Antilocaprinae
Tribe:Antilocaprini
Genus:Antilocapra
Ord, 1818
Species:A. americana[

Coyote (Canis latrans)

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Coyote (Canis latrans) enduring a snow storm in Joshua Tree National Park - Photo by James L Rathbun
Coyote (Canis latrans) enduring a snow storm in Joshua Tree National Park – Photo by James L Rathbun

A symbol of the American Southwest, the howl of the humble Coyote (Canis latrans) is synonymous with wild places. A member of the canine family and cousin to your pet, the coyote is a carnivore, predator, scavenger and survivor and even have a gord named for them, the coyote melon. The mammal is also known as the “little wolf”, “brush wolf”, “prairie wolf” and “American jackal”.

Although not necessarily nocturnal, they may hunt at night in the presence of humans. Regardless, they are more active in the evenings. They prowl and hunt in small groups. Their cries and howls at night are the reason they are known as the most vocal wild animal North American Animals. Personally, I welcome their vocalizations echoing access the desert night.

Coyote hunt reptiles, birds, small mammals, fish and even the larger bison, deer, elk and sheep. They roam up to ten miles per day on a constant hunt for food. In urban areas, this opportunist animal will eat dog and cat food, and known to attack domestic dogs and cats. In Death Valley National Park this resourceful jackal will eat large quantities of beetles and hawkmoth caterpillars for food. They are extremely resourceful and opportunistic survivors.

The coyote is classified in 19 different subspecies throughout the North America. A typical male will weigh between 18 and 44 pounds, while the female tips the scale a at a more modest 15 to 40 pounds. The fair color ranges from a light grey, tan to dark browns or even black depending upon habitat.

Coyote (Canis latrans) enduring a snow storm in Joshua Tree National Park - Photo by James L Rathbun
Coyote (Canis latrans) enduring a snow storm in Joshua Tree National Park – Photo by James L Rathbun

In Native American cultures, folklore depicts the coyote as a trickster. For this Irish American over a certain age, the coyote is call as wiley, known as a super genius and has, upon occasion, ordered an abundance of explosive from the Amce Corporation .

Resources

Classification

Kingdom:Animalia
Phylum:Chordata
Class:Mammalia
Order:Carnivora
Family:Canidae
Genus:Canis
Species:C. latrans

Black Tailed Jackrabbit ( Lepus californicus )

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Black Tailed Jackrabbit enjoying the shade of a Joshua Tree
Black Tailed Jackrabbit enjoying the shade of a Joshua Tree.

The Black Tailed Jackrabbit (Lepus californicus) commonly known as the American Desert Hare makes its home in the western half of the United States including California, Nevada, Arizona and parts of Mexico. One of the largest species of hare, the animal boasts large distinctive ears, powerful rear legs, black tips on its ears and a black tail for which the animal gets its name.

This species of hare commonly reaches sizes of 18 to 24 inches long and may weigh between 4 and 8 pounds. Typically, the females are slightly larger compared to the males. The animal will mate ear round depending upon environment and the young are born with a full compliment of fir and open eyes, which classifies it as a true hare and not a rabbit, despite its common name. The female does not build elaborate nests for birth. A new born hare is and well camouflaged and quite mobile within minutes of birth. The juveniles will stay near the mother for nursing, but are not protected by the mother.

Commonly found in desert scrub, prairies and meadows at elevations up to 10,000 feet, the Black Tailed Jackrabbit is quite adaptive to various environments. Camouflage is their only defense, and they will freeze when a threat is near. Their diet consists of a variety of green vegetation and grasses, however they are known to consume dried or woody plants in the harsh winter months. The hare does not hibernate during the winter months.


IUCN Red List of Threatened Species, species assessors and the authors of the spatial data.

The Black Tailed Jackrabbit is a valuable member of the ecosystem. It serves as a prey item of other carnivorous animals including coyotes, foxes, eagles, hawks, owls and various Native American tribes.

Classification

Kingdom:Animalia
Phylum:Chordata
Class:Mammalia
Order:Lagomorpha
Family:Leporidae
Genus:Lepus
Species:L. californicus