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Operative tel1lJerature (OC)
Figure 4.3 : Time spent outside of a den (mean ± SE) in a day for male (open circles) and female (fi lied circles) North Ameri can
porcupines and OCCU1Tence offeeding behaviour (mean ± SE) when in a coniferous tree (fi lled squares: males and females pooled since
difference between sexes was not significant) as a function of operative temperature, Parc National du Bic, Québec, January to April,
2004-2005. Sample sizes are specified near each symbol as: number of individuals, number of observations on those individuals.