Category: Mammals

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Rocky the Flying Squirrel

Northern Flying Squirrel
Photo Courtesy
Phil Myers (photographer, copyright holder)
Museum of Zoology, University of Michigan
This work is licensed under a
Creative Commons
Attribution-Noncommercial-Share Alike
3.0 Unported License.

Hi, I’m Holly Strand from Stokes Nature Center in beautiful Logan Canyon.

There’s a large paper wasp nest on display on a bookcase at the Nature Center. Last week, Anna and I noticed some strange noises emanating from it. It even seemed to move a little on the shelf. We carefully –and a bit nervously–approached to investigate. I picked up the nest and it began to shake vigourously. Then a live missile shot out of the opening. It was a chubby little squirrel with huge dark eyes. He jumped from the bookcase and went scurrying across the floor with Anna and I in hot pursuit. Then he scampered up to the top of a door frame. We tried to catch him with a cardboard box, but he spread his little legs out wide and went sailing over our heads, landing smoothly on floor across the room. And then he ran under the couch. We stood there in amazement. He wasn’t your normal squirrel—he was a flying squirrel!

The northern flying squirrel is one of two flying squirrels found in United States, the other being the southern flying squirrel . Northern flying squirrels occur in many of Utah’s mountainous areas, primarily in mature coniferous forests and riparian zones.

According to Mike Wolfe at the Utah State University’s College of Natural Resources, they aren’t exactly rare in Logan Canyon. In fact, they are active here throughout the year, but they’re completely nocturnal. So many people never see them and are surprised to find that we have them.

Flying squirrels don’t really fly. They glide. They have a loose fold of skin known as a patagium which runs along each side of the body from the ankle of the hind leg to the wrist of the foreleg. When they stretch this membrane and launch they instantly become a furry paraglider, capable of covering great distances using a small fraction of the energy it would take to run.

Rocky, as we called the nature visitor, proved very difficult to catch. In the end, we used a live trap baited with apples and sunflower seeds. On Thanksgiving morning, my husband and I found him sitting in it, wishing he were somewhere else. We took him up the canyon and released him. He scampered up a tree and seemed to regard us thoughtfully. On the way back to the car, I looked back once more and was lucky enough to see one last beautiful 20 ft glide from tree to tree.

Thanks to the USU College of Natural Resources for supporting research and development of this Wild About Utah topic.

For Wild About Utah and Stokes Nature Center, I’m Holly Strand.
Credits:

Images: Courtesy Washington Department of Fish and Wildlife and Phil Myers (photographer, copyright holder), Museum of Zoology, University of Michigan, licensed under CCA-Noncommercial-Share Alike 3.0 Unported License.
Text:     Holly Strand, Stokes Nature Center

Sources & Additional Reading:

Flyingsquirrels.com  [Accessed December 4, 2009]

Utah Division of Wildlife Resources.  Utah Conservation Data Center. Species database.  NORTHERN FLYING SQUIRREL.  https://dwrcdc.nr.utah.gov/rsgis2/Search/Display.asp?FlNm=glausabr  [Accessed December 04, 2009]

Malamuth, E. and M. Mulheisen. 1999. “Glaucomys sabrinus” (On-line), Animal Diversity Web. https://animaldiversity.org/accounts/Glaucomys_sabrinus/pictures/collections/contributors/phil_myers/classic/sabrinus1/   [Accessed December 04, 2009]

 

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Tales of the Packrat The Legacy of Early Grazing on Utah’s Rangelands

Tales of the Packrat: Pack Rat Midden, Photo Courtesy and Copyright 2009 Ken Cole - All Rights Reserved
Pack Rat Midden
Copyright © 2009 Ken Cole

Reaching for a Pack Rat Midden, Click to Zoom, Photo Courtesy and Copyright 2009 Ken Cole - All Rights Reserved Reaching for a Pack Rat Midden
Copyright © 2009 Ken Cole

One of the best storytellers in Utah’s national parks is not a ranger, but the lowly packrat.Tales of the Packrat
Their stories of past plant communities are written in their middens. The midden is a heap of leaves, twigs, seeds and fruits the packrat discards outside its nest. Protected in a desert cave or rock crevice and preserved by a rat’s own urine, this heap is a detailed and accurate time capsule of the past local flora.

Ken Cole with the US Geological Survey is a fluent translator of the packrat’s stories. Ken and colleagues sampled old packrat nests around Glen Canyon National Recreation Area and Capitol Reef National Park. By carbon-14 dating, the nest ages are known to span the last 10,000 years. As controls, they also collected nests from mesa tops inaccessible to livestock. Ken and colleagues then carefully translated these packrats’ stories by identifying and counting the plant fragments in these fossil nests.

At both Capitol Reef and Glen Canyon, old packrat nests revealed pre-settlement plant communities that were rich in diverse grasses, wildflowers and shrubs. Then these floras changed. Beginning 150 years ago, vast herds of sheep and cattle tromped and chewed their way across the unfenced rangelands of Utah in numbers unimaginable today. We know that palatable plant species and those susceptible to trampling suffered declines, because they are absent from middens from that time period. Unpalatable shrubs multiplied. Despite curtailed grazing in subsequent decades at Capitol Reef and Glen Canyon, packrats show us that the flora still has not recovered. Like Aesop’s fables, this cautionary lesson of the packrat’s ecological tale remains clear and relevant today. We should all listen.

This is Linda Kervin for Bridgerland Audubon Society.
Tales of the Packrat
Credits:
Photos: Courtesy and Copyright Ken Cole
Text: Julio Betancourt USGS and Jim Cane, Bridgerland Audubon
Additional Reading:

Betancourt, Julio L., Thomas R. Van Devender, and Paul S. Martin, eds. Packrat Middens: The Last 40,000 Years of Biotic Change, University of Arizona Press, 1990 https://www.uapress.arizona.edu/books/BID40.htm

Pack Rat Middens, Colorado Plateau in Land Use History of North America, Ken Cole, USGS/Northern Arizona University, https://cpluhna.nau.edu/Tools/packrat_middens.htm

Introduction [to Carbon 14 Dating], Tom Higham, Radiocarbon Laboratory, University of Waikato, New Zealand https://www.c14dating.com/int.html [Sep 24, 2009]

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Utah’s Recent Pinyon Migrations and the Prospects for Climate Change

Packrat Fossil Midden City of RocksCourtesy and Copyright 2009 Julio Betancourt - All Rights Reserved
Packrat Fossil Midden
City of Rocks
Copyright © 2009 Julio Betancourt

In the late 1970’s, springtime in the American West warmed abruptly by 2 degrees Fahrenheit in the valleys, double that higher up. Our average onset of Spring now comes a week earlier across the West. If these are the first signs of climate change, even longer growing seasons will trigger not just earlier blooms but also northward plant migrations.

The past provides us with lessons about plant migrations. A thousand years ago, one-needle pinyon hopped from the Raft River Mountains in Utah to City of Rocks, Idaho. Across Utah, two-needle pinyon leaped over the Uintas to Flaming Gorge. We know this from radiocarbon dates on pinyon pine needles taken from ancient nest heaps of packrats preserved in caves. According to Dr. Julio Betancourt of the U.S. Geological Survey, who uses these packrat middens and tree rings to reveal past plant migrations, these recent advances by Utah’s two pinyon pines followed the Medieval Climate Anomaly, a period from 900 to 1300 AD marked by warming in Europe and severe drought in Utah.

Packrat 7000 year old Midden Joshua Tree Natl Park, Courtesy and Copyright © 2009 Julio Betancourt - All Rights Reserved
Packrat 7000 year old Midden
Joshua Tree Natl Park
Copyright © 2009 Julio Betancourt

Droughts figure prominently in Dr. Betancourt’s view of tree migrations. Droughts trigger bark beetle infestations, wildfires, and tree dieoffs, opening up niches for regeneration. When the drought abates, the resident tree species typically return. With long-term warming, however, other species can move in from lower elevations or further south. Dead trees now abound on Utah’s landscape, and Dr. Betancourt thinks that we are on the verge of a new spate of tree migrations.

This go around, which species retreat or advance will depend on new factors, including human fragmentation of the landscape and accelerated dispersal of native and non-native species that hitch rides with us. To conserve ecological goods and services associated with some species, Dr. Betancourt argues, we will have to manage for these plant migrations.

This is Linda Kervin for Bridgerland Audubon Society.

Credits:

Photo: Courtesy and © Copyright 2009 Julio Betancourt

Text: Julio Betancourt USGS NRP Tucson: Biotic Response to Climate Variability

Faculty and Staff > Julio Betancourt

Additional Reading:

USGS National Research Program: Tucson AZ
https://wwwpaztcn.wr.usgs.gov/home.html

Climate Change and the Great Basin, Jeanne C. Chambers, USDA Forest Service, Rocky Mountain Research Station, Reno, NV, 2008,

A Database of Paleoecological Records from Neotoma Middens in Western North America, USGS/NOAA North American Packrat Midden Database, https://esp.cr.usgs.gov/data/midden/ (Accessed 27 August 2009)

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The Eyes Have It

The Eyes Have It: Deer Eyeshine Courtesy of National Park Service, US Department of the Interior
Deer Eyeshine Courtesy of National Park Service
US Department of the Interior

Hi, this is Holly Strand for Stokes Nature Center located in beautiful Logan Canyon.

A few years ago, I was working for World Wildlife Fund in eastern Montana. One night, we were doing a nocturnal survey of the black footed ferret, the most endangered mammal species in North America. We were counting reintroduced ferrets by riding around in a truck with a large spotlight mounted on top. When the spotlight hit a ferret, we could see the emerald green glow of its eyes as the animal looked back at the light. We’d stop the truck, walk toward the green points, and confirm the presence of a curious ferret for our census count. If the glowing eye color was something other than green we kept on driving. It was during this nocturnal safari that I learned about animal eye-shine and how it can be used by hunters as well as naturalists in finding target species.

Eyeshine occurs when light enters the eye, passes through the rods and cones strikes a special membrane behind the retina, and is reflected back through the eye to the light source. This special mirror-like membrane, called the tapetum (ta-PEA-tum), is not present in the human eye. The light-capturing system allows light to pass through the eye twice, and it is one way a nocturnal animal increases its ability to see in dim light. It’s the tapetums cause the eerie glow that we see in a housecat’s eyes caught in a light or when our car headlights surprise a deer, or badger.

The color of eyeshine varies from species to species. Most owls have red eyeshine. Coyotes as well as mountain lion shine greenish-gold. Elk and deer – varies from silver white to a light silvery green or light silvery yellow. Desert cottontails’ are red. Tiny pricks of light may signify the presence of wolf spiders or moths. Even certain fish have eyeshine.

To see eyeshine in the wild, just take a walk on a relatively dark night, and hold a flashlight on top of your head so that you are looking down the beam. Direct the beam at bushes or low vegetation. Chances are, you’ll see the pink-tinted eyeshine of spiders. Near water, look for the greenish glow of frogs’ eyes. Keep the beam directed at the eyeshine and move closer until you can spot its owner. Bigger animals like deer or raccoons will be farther away so you may want to use binoculars in combination with a light, lining up the field of view with the light beam, and then moving the two in unison. Searching for eyeshine is the perfect summer night activity, so grab your flashlight and go out and experience some real Utah night life.

This is Holly Strand for Wild About Utah.

Credits:

Photo: Courtesy of National Park Service, US Department of the Interior Wind Cave Resource Ramblings 2007 – 11

Text: Stokes Nature Center: …

Sources & Additional Reading

2001, Corben, Chris and Gary Fellers. A Technique for Detecting Eyeshine of
Amphibians and Reptiles. Herpetological Review, 32(2): 89-91.
https://www.werc.usgs.gov/pt-reyes/pdfs/spotlighting.pdf

Eyeshine. Electronic Naturalist. Roger Tory Peterson Institute of Natural History. https://www.enaturalist.org/unit/171/qr (accessed June 2008)

Texas Parks and Wildlife. Eyeshine in Young Naturalist Series. https://www.tpwd.state.tx.us/publications/nonpwdpubs/young_naturalist/animals/eyeshine/ (accessed June 2008)

Thanks to Eric Gese, USDA National Wildlife Research Center, Department of Forest, Range, and Wildlife Sciences, for his expertise.