Abstract
Growth rates and developmental patterns were determined on four litters each for two species of chipmunks, Eutamias panamintinus and E. palmeri , raised in the laboratory. E. palmeri were larger and had a faster rate of development in the early postnatal period, that is, earlier appearance of hair on head, erect pinnae, ability to stand, eruption of upper incisors, and appearance of cheek teeth. In weight and linear measurements, E. palmeri had faster growth rates than E. panamintinus . Constant growth rate (k) based on weight for E. panamintinus was 0.076 and for E. palmeri , 0.092. An accelerated ontogeny is characteristic of sciurids that hibernate; therefore, we attribute the more rapid growth rate of E. palmeri to its more extended period of hibernation at higher elevations.
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