Sasha Tetzlaff


I joined the Sperry-DeGregorio Lab as a Ph.D. student in 2016. My fieldwork takes place at Fort Custer Training Center in southern Michigan, but I am also rearing turtles and conducting behavioral assays with them on the UIUC campus. Check out for more info.

I graduated from Florida Gulf Coast University with a B.A. in Environmental Studies in 2011. While an undergraduate, I participated in long-term research projects focusing on Gopher Tortoise ecology in an urban greenspace and monitoring trends in anuran communities in southwest Florida. I earned my M.S. in Biology from Purdue University–Fort Wayne in 2015, where I studied the behavioral effects of food supplementation on free-ranging male massasauga rattlesnakes in northern Michigan.


Tetzlaff, S.J., J.H. Sperry, and B.A. DeGregorio. 2018. Attempted depredation of a juvenile Eastern Box Turtle, Terrapene carolina (Linnaeus, 1758), by Sandhill Cranes, Antigone canadensis (Linnaeus, 1758). Herpetology Notes 11: 589–591.

Tetzlaff, S.J., J.H. Sperry, and B.A. DeGregorio. 2018. Captive-reared juvenile box turtles innately prefer naturalistic habitat: implications for translocation. Applied Animal Behaviour Science 204: 128–133.

DeGregorio, B.A., M.J. Ravesi, J.H. Sperry, S.J. Tetzlaff, J.M. Josimovich, M. Matthews, and B.A. Kingsbury. 2018. Daily and seasonal activity patterns of the Massasauga (Sistrurus catenatus): an automated radio telemetry study. Herpetological Conservation and Biology 13: 10–16.

Hileman, E.T., M.C. Allender, D.R. Bradke, L.J. Faust, J.A. Moore, M.J. Ravesi, and S.J. Tetzlaff. 2018. Estimation of Ophidiomyces prevalence to evaluate snake fungal disease risk. The Journal of Wildlife Management 82: 173–181.

Tetzlaff, S.J., M.J. Ravesi, M.C. Allender, E.T. Carter, B.A. DeGregorio, J.M. Josimovich, and B.A. Kingsbury. 2017. Snake fungal disease affects behavior of free-ranging Massasauga Rattlesnakes (Sistrurus catenatus). Herpetological Conservation and Biology 12: 624–634.

Tetzlaff, S.J., E.T. Carter, B.A. DeGregorio, M.J. Ravesi, and B.A. Kingsbury. 2017. To forage, mate, or thermoregulate: influence of resource manipulation on male rattlesnake behavior. Ecology and Evolution 7: 6606–6613.

Ravesi M.J., S.J. Tetzlaff, M.C. Allender, and B.A. Kingsbury. 2016. Detection of Snake Fungal Disease from a Lampropeltis triangulum (Eastern Milksnake) in northern Michigan. Northeastern Naturalist 23: N18–N21.

Tetzlaff, S.J. and N.G. Schiltz. 2016. Eastern Box Turtle (Terrapene carolina). Scavenging. Herpetological Review 47: 453–454.

Allender, M.C., E.T. Hileman, J.A. Moore, and S.J. Tetzlaff. 2016. Detection of Ophidiomyces, the causative agent of snake fungal disease, in the Eastern Massasauga (Sistrurus catenatus) in Michigan. Journal of Wildlife Diseases 52: 694–698.

Tetzlaff, S.J., K.E. Tetzlaff, and R.J. Connors. 2016. Evaluation of thermal regimes for transported ambassador ectotherms: one size does not fit all. Zoo Biology 35: 339–345.

Tetzlaff, S.J., M.J. Ravesi, and B.A. Kingsbury. 2016. Sistrurus catenatus (Massasauga) Activity Range Lengths. Herpetological Review 47: 154–155.

Ravesi, M.J., S.J. Tetzlaff, and B.A. Kingsbury. 2016. Sistrurus catenatus (Massasauga) Diet. Herpetological Review 47:153–154.

Ravesi, M.J., M.J. Forzley, S.J. Tetzlaff, B.A. Kingsbury, and J.M. Parker. 2015. Sistrurus catenatus (Massasauga) Diet. Herpetological Review 46: 453–454.

Ravesi, M.J., S.J. Tetzlaff, and B.A. Kingsbury. 2015. Sistrurus catenatus (Massasauga) Overwintering Site. Herpetological Review 46: 454.

Tetzlaff, S.J. and M.J. Ravesi. 2015. Glyptemys insculpta (Wood Turtle) Mortality. Herpetological Review 46: 243.

Tetzlaff, S.J., M.J. Ravesi, J.M. Parker, M.J. Forzley, and B.A. Kingsbury. 2015. Feeding and breeding: a northern population of Massasauga Rattlesnakes, Sistrurus catenatus (Rafinesque 1818), continues to hunt during the mating season. Herpetology Notes 8: 277–280.

Tetzlaff, S.J., M.C. Allender, M.J. Ravesi, J.A. Smith, and B.A. Kingsbury. 2015. First report of snake fungal disease from Michigan, USA involving Massasaugas, Sistrurus catenatus (Rafinesque 1818). Herpetology Notes 8: 31–33.

Tetzlaff, S.J., M.J. Ravesi, and B.A. Kingsbury. 2014. Sistrurus catenatus catenatus (Eastern Massasauga) Diet. Herpetological Review 45: 712–713.

Tetzlaff, S.J. 2014. Diadophis punctatus (Ring-necked Snake) Diet. Herpetological Review 45: 710.

Tetzlaff, S.J. 2014. Crotalus horridus (Timber Rattlesnake) Habitat Use. Herpetological Review 45: 709.

Tetzlaff, S.J., D.L. Tetzlaff, M. Schoenbeck, and N. Clark. 2014. Agkistrodon piscivorus conanti (Florida Cottonmouth) Diet and Phenotype. Herpetological Review 45: 511–512.