California kangaroo rat

California kangaroo rat
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Rodentia
Family:	Heteromyidae
Genus:	Dipodomys
Species:	D. californicus
Binomial name
Dipodomys californicus Merriam, 1890

The California kangaroo rat (Dipodomys californicus) is a species of rodent in the family Heteromyidae.^[2] However, populations are declining, having not fully recovered after the drought in California from 2013 to 2015 destroyed their habitat (the grasslands) and changed it into desert.

Description

Size

The California kangaroo rat is, on average, 312 mm long, with its tail vertebrae comprising 195mm of that total length. Based on its length, experts conclude the weight of the species to be around 75 grams, making its size fairly normal amongst other kangaroo rats in California.^[3] The species generally tends to be larger in the northern areas of its distribution (near Modoc County), whereas the smaller animals are often found further south, near the SF Bay Area and Marin County.^[3]

Coloration

Dipodomys californicus has an almost all-white underside, including its feet, belly, and forelegs; they also have a dash of black near the ankle. The upper surface of the body tends to be a dark cinnamon-tan shade, extending everywhere but the face, which features darker facial markings. During the molting season for the kangaroo rat (around July through November), the active shedding of the previous year's fur will result in a lighter-textured coat growing anew; the colors remain consistent, however, and the animals' colors generally don't fade or change throughout their lives.^[3]

Distribution

The California kangaroo rat is endemic to western North America, found in Northern California and southern Oregon.^[4] Its distribution is from the Sierra Nevada foothills to Suisun Bay, and northwards in the California Coast Ranges to the foothills of the Cascade Mountains.^[1] However, as of 2020, the California kangaroo rat has been found in north Nevada, 1627–1900 meters in elevation. Not only does this make suggest the most easterly sighting of the species, but it also marks the highest altitude that the species has ever been found.^[5] California's Kangaroo Mountain was likely named after the California kangaroo rat.^[6]

It is an IUCN listed Least Concern species, due to the rather large home area and vast range of its distribution. The populations also thrive due to the fact that the kangaroo rat is adapted to thrive in hostile climates, where very few humans (in general) have encroached or developed infrastructure. In the cases of populations where the kangaroo rats do live within or near to human settlements, their ecological niche seems to be far less offensive and intrusive towards people than house mice or common rats, making their survival even more likely; kangaroo rats do not scavenge off of trash, human food or waste and do not nest in human habitations. Likewise they do not carry the same pathogens as common mice or rats, further ensuring a steady population.^[1]

Taxonomy

Dipodomys californicus was formerly included as a subspecies of Dipodomys heermanni, but differs enough in chromosomal and biochemical characteristics to warrant being recognized as a distinct species. One such distinction between Dipodomys californicus and other four toed species of Dipodmys heermanni is their unique tail coloration which features a white tip with black stripes on the top and bottom.^[5]

References

1. Cassola, F. (2017) [errata version of 2016 assessment]. "Dipodomys californicus". IUCN Red List of Threatened Species. 2016: e.T42599A115193510. doi:10.2305/IUCN.UK.2016-3.RLTS.T42599A22228114.en. Retrieved 10 March 2022.
2. Patton, J.L. (2005). "Family Heteromyidae". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 844–845. ISBN 978-0-8018-8221-0. OCLC 62265494.
3. Goldman, E. A.; Grinnell, Joseph (November 1922). "A Geographical Study of the Kangaroo Rats of California". Journal of Mammalogy. 3 (4): 264. doi:10.2307/1373259. hdl:2027/hvd.32044107347767. ISSN 0022-2372. JSTOR 1373259.
4. National Museum of Natural History: Dipodomys californicus .
5. Miles, Danielle C; Burrus, Kelsey R; Shoemaker, Kevin T (2020). "First Records of California Kangaroo Rats, Dipodomys Californicus, in Nevada". Northwestern Naturalist. 101 (1): 61–63. doi:10.1898/1051-1733-101.1.61. S2CID 211228422.
6. Bright, William (1998). 1500 California Place Names: Their Origin and Meaning. University of California Press. p. 75. ISBN 978-0-520-21271-8.

External links

• IUCN Red List: Distribution Map — Dipodomys californicus