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Thank you to:
Dr. Vanessa Petro, Oregon State Univ.
Dr. Peter Busher, Boston Univ.
Dr. Emily Fairfax, CSU Channel Islands
Dr. Clint Epps, Oregon State Univ.
Dr. Lyle M. Gordon, Northwestern Univ.
Mike Callahan, Beaver Institute
Bob Armstrong “Nature Bob,” Univ. of Alaska
Michael Graydon
Ben Goldfarb, author of “Eager: The Surprising, Secret Life of Beavers and Why They Matter"
James St. John
Julio Lacerda
Thilo Park
Janet Pesaturo,
Winterberry Wildlife
N.Tamura
National Wildlife Research Center, Oregon Field Station
Jak Wonderly
US Forest Service Mendenhall Glacier Web Cam

CC Images:
Beaver Skull Cut: Thilo Parg / Wikimedia Commons CC BY 4.0
https://commons.wikimedia.org/wiki/Fi...

Palaeocastor fossor and Palaeocastor and burrow in National Museum of Natural History: Claire H. (flickr) CC BY 2.0
https://en.wikipedia.org/wiki/Palaeoc...

Palaeocastor BW.jpg: Nobu Tamura CC3.0 Unported
https://en.wikipedia.org/wiki/Palaeoc...

Daemonelix burrow James St. John CCBY 2.0
https://commons.wikimedia.org/wiki/Fi...

Additional footage from:
Envato Elements
Shutterstock.com
Pond5.com
Alamy.com

Citations:
Aleksiuk, M. ScentMound Communication, Territoriality, and Population Regulation in Beaver (Castor canadensis Kuhl), Journal of Mammalogy, Volume 49, Issue 4, 26 November 1968, Pages 759–762,  https://doi.org/10.2307/1378741

Badyaev, A.V. Beavers: Masters of Downfall. National Wildlife, July 25, 2015.

Brazier, R.E., Puttock, A., Graham, H.A., Auster, R.E., Davies, K.H., Brown, C.M.L. Beaver: Nature's ecosystem engineers. WIREs Water. 2021; 8:e1494. https://doi.org/10.1002/wat2.1494

Buech, R. R. (1984). Ontogeny and Diurnal Cycle of Fecal Reingestion in the North American Beaver (Castor canadensis). Journal of Mammalogy, 65(2), 347–350. https://doi.org/10.2307/1381180

Gordon L.M., Cohen M.J., MacRenaris K.W., Pasteris J.D., Seda T., Joester D. Dental materials. Amorphous intergranular phases control the properties of rodent tooth enamel. Science. 2015 Feb 13;347(6223):74650. doi: 10.1126/science.1258950. PMID: 25678658.

Halicioglu K, Celikoglu M, Buyuk SK, Sekerci AE, Ucar FI, Yavuz I. Threedimensional evaluation of the mandibular third molars' development in unilateral crossbite patients: A cone beam computed tomography study. Eur J Dent. 2014 Jul;8(3):389394. doi: 10.4103/13057456.137653. PMID: 25202221; PMCID: PMC4144139.

PopCiutrila, IoanaSofia & Ghinea, Razvan Ionut & Colosi, Horațiu & RuizLópez, Javier & Pérez Gómez, María del Mar & Paravina, Rade & Dudea, Diana. (2021). Color compatibility between dental structures and three different types of ceramic systems. BMC Oral Health. 21. 10.1186/s12903021014047.

Morris, P.J.R., Cox, P.G. & Cobb, S.N.F. The biomechanical significance of the elongated rodent incisor root in the mandible during incision. Sci Rep 12, 3819 (2022). https://doi.org/10.1038/s4159802207...

Mott C.L., Bloomquist, C.K., and Nielsen, C.K. Seasonal, diel, and ontogenetic patterns of withinden behavior in beavers (Castor canadensis),Mammalian Biology, Volume 76, Issue 4, 2011,Pages 436444, ISSN 16165047, https://doi.org/10.1016/j.mambio.2010....

Muller, G. and Watling, J. (2016) The engineering in beaver dams. River Flow 2016: Eighth International Conference on Fluvial Hydraulics, , Saint Louis, United States. 12 15 Jul 2016. 7 pp.

Patenaude, F. and Bovet, J.. Selfgrooming and social grooming in the North American beaver, Castor canadensis.  Canadian Journal of Zoology. 62(9): 18721878. https://doi.org/10.1139/z84273

Richard, P.B. Le déterminisme de la construction des barrages chez le Castor du Rhône. Revue d’Ecologie, Terre et Vie, Société nationale de protection de la nature, 1967, pp.339470. hal03531683

Rosell, F., Bergan, F. & Parker, H. ScentMarking in the Eurasian Beaver (Castor fiber) as a Means of Territory Defense. J Chem Ecol 24, 207–219 (1998). https://doi.org/10.1023/A:1022524223435

Stefen, C., Habersetzer, J., and Witzel, U. Biomechanical aspects of incisor action of beavers ( Castor fiber L.) ,  Journal of Mammalogy, Volume 97, Issue 2, 23 March 2016, Pages 619–630,  https://doi.org/10.1093/jmammal/gyv209

Wilsson, L. Observations and Experiments on the Ethology of the European Beaver (Castor Fiber L.). Swedish Wildlife, Published by Swedish Sportsmen’s Association Vol. 8 Number 3.