MammalBase - Accepted taxon: Castor canadensis

Accepted taxon: Castor canadensis
Taxon:	Castor canadensis
Rank:	Species
Higher Classification:	RODENTIA \| CASTORIMORPHA \| Castoridae \| Castor
Reference:	Wilson, Don E., and DeeAnn M. Reeder, eds. Mammal Species of the World. A Taxonomic and Geographic Reference (3rd ed), JHU Press, 2005.

Fig.1 - Ternary plot of the proximate analysis for the Castor canadensis diet.
CF (Crude Fibre) 36, ASH (Ash contents) 7, NFE (Nitrogen-Free-Extract) 46, CP (Crude Protein) 7, EE (Ether Extract) 4. See details for the calculations in Lintulaakso, K., Tatti, N. and Žliobaitė, I., 2022. Quantifying mammalian diets. Mammalian Biology, pp.1-15. [DOI]

Table 1. List of Diet Items for Castor canadensis.
TSN Complete name	Part	Ratio ^a.	Reference(s)
Magnoliopsida	BARK	24.07	Damuth, J…
Magnoliopsida	STEM	12.64	Damuth, J…
Populus	LEAF	11.65	Grzimek,B…
Magnoliopsida	SHOOT	6.67	Grzimek,B…
Coniferophyta	LEAF	6.67	Grzimek,B…
Populus X berolinensis	BARK	6.48	Reid,F., …
Coniferophyta	STEM	6.06	Grzimek,B…
Betula	LEAF	5.56	Reid,F., …
Populus	BARK	4.85	Grzimek,B…
Acer	SHOOT	4.63	Reid,F., …
Salix	STEM	3.70	Reid,F., …
Alnus	LEAF	2.78	Reid,F., …
Poaceae	STEM	2.42	Grzimek,B…
Magnoliopsida	LEAF	1.82	Grzimek,B…

^a. Standardized values. See details for the calculations in Lintulaakso, K., Tatti, N. and Žliobaitė, I., 2022. Quantifying mammalian diets. Mammalian Biology, pp.1-15. [DOI]

Table 2. List of Standard Traits for Castor canadensis.
Trait	Selected Value	All Value(s)	Reference(s)
Dietary category: Miljutin 2009	Herbivore	Herbivore	– JOSHUA X. SAMUELS, 2009, 'Cranial morphology and dietary habits of rodents', Zoological Journal of the Linnean Society, vol. 156, no. 4, pp. 864-888
Locomotion: Eisenberg 1981	Semiaquatic	Semiaquatic	– Joshua X. Samuels, Blaire Van Valkenburgh, 2008, 'Skeletal indicators of locomotor adaptations in living and extinct rodents', Journal of Morphology, vol. 269, no. 11, pp. 1387-1411, Joshua X. Samuels, Blaire Van Valkenburgh, 2008, 'Skeletal indicators of locomotor adaptations in living and extinct rodents', Journal of Morphology, vol. 269, no. 11, pp. 1387-1411

Table 3. List of Standard Measurements for Castor canadensis.
Measurement	Location	Unit	n Total	n Unknown	n Female	n Male	Min	Mean	Max	SD	Reference(s)
Body Mass (BM)	nan	g	12	12	-	-	-	20,276.96	-	-	Engelman,…
Body Mass (BM)	nan	g	-	-	-	-	9,070	-	44,000	-	Freudenth…
Head-Body Length (HBL)	nan	mm	10	10	-	-	-	789	-	-	Engelman,…
Occipital condyle width (OCW)	nan	mm	12	12	-	-	-	31.78	-	-	Engelman,…

Table 4. List of other Measurements ^b. for Castor canadensis.
Measurement	Location	Unit	n Total	n Unknown	n Female	n Male	Min	Mean	Max	SD	Reference(s)
brainmass	nan	g	-	-	-	-	-	52	-	-	Engelman,…
skull_length	nan	mm	-	-	-	-	-	129	-	-	Engelman,…
BMR (kJ/h)	nan	kJ/h	-	-	-	-	-	93	-	-	McNab, B.…
femur circumference	nan	mm	-	-	-	-	-	43	-	-	Nelson, A…
femur diameter	nan	mm	-	-	-	-	-	19	-	-	Nelson, A…
humerus circumference	nan	mm	-	-	-	-	-	35	-	-	Nelson, A…
BMR,mlO2/h	nan	mlO2/h	4	4	-	-	-	4,688	-	-	Genoud, M…

^b. other Measurements. Source Measurements which are not listed on or mapped with the Standard Traits..

Table 5. List of Data Sources for Castor canadensis.
Taxon	Reference	Match	Status
Castor canadensis	SAMUELS,J. X., 2009, Cranial morphology and dietary habits of rodents, Zoological Journal of the Linnean Society	1: Exact Taxon match	Verified - Accepted
Castor canadensis	Samuels,J. X., 2008, Skeletal indicators of locomotor adaptations in living and extinct rodents, Journal of Morphology	1: Exact Taxon match	Verified - Accepted
Castor canadensis	Damuth, J. 2010. ABSOLUT 6 a mammalian database compiled by the national center for ecological analysis and synthesis (NCEAS ) workshop on mammalian communities.	1: Exact Taxon match	Verified - Accepted
Castor canadensis	Samuels, Joshua X., and Blaire Van Valkenburgh. Ã¢â‚¬Å“Skeletal Indicators of Locomotor Adaptations in Living and Extinct Rodents.Ã¢â‚¬Â J. Morphol. 269, no. 11 (November 2008): 1387Ã¢â‚¬â€œ1411. doi:10.1002/jmor.10662.	1: Exact Taxon match	Verified - Accepted
Castor canadensis	Reid,F., 2006, Peterson field guide to mammals of North America,	1: Exact Taxon match	Verified - Accepted
Castor canadensis	Grzimek,B., 2003, Grzimek's Animal Life Encyclopedia: Mammals I-V,	1: Exact Taxon match	Verified - Accepted
Castor canadensis	Engelman, R.K., 2022. Occipital condyle width (OCW) is a highly accurate predictor of body mass in therian mammals. BMC biology, 20(1), p.37.	1: Exact Taxon match	Verified - Accepted
Castor canadensis	Lundgren, E.J., Schowanek, S.D., Rowan, J., Middleton, O., Pedersen, R.Ø., Wallach, A.D., Ramp, D., Davis, M., Sandom, C.J. and Svenning, J.C., 2021. Functional traits of the world’s late Quaternary large-bodied avian and mammalian herbivores. Scientific data, 8(1), p.17.	1: Exact Taxon match	Verified - Accepted
Castor Canadensis	McNab, B.K., 2008. An analysis of the factors that influence the level and scaling of mammalian BMR. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 151(1), pp.5-28.	1: Exact Taxon match	Verified - Accepted
Castor canadensis	Nelson, A., Engelman, R.K. and Croft, D.A., 2023. How to weigh a fossil mammal? South American notoungulates as a case study for estimating body mass in extinct clades. Journal of Mammalian Evolution, 30(3), pp.773-809.	1: Exact Taxon match	Verified - Accepted
Castor canadensis	Genoud, M., Isler, K. and Martin, R.D., 2018. Comparative analyses of basal rate of metabolism in mammals: data selection does matter. Biological Reviews, 93(1), pp.404-438.	1: Exact Taxon match	Verified - Accepted
Castor canadensis	Freudenthal, M. and Martín-Suárez, E., 2013. Estimating body mass of fossil rodents. Scripta Geologica, 145, pp.1-513.	1: Exact Taxon match	Verified - Accepted

Citation for this page: [The MammalBase community 2026. / CC BY 4.0. http://doi.org/10.5281/zenodo.7462864 Castor canadensis , Accessed 2nd April 2026 at https://mammalbase.net/me/7421]