We studied daily rhythmicity of body temperature (T b) before and during hibernation in
Anatolian ground squirrels (Spermophilus xanthoprymnus) under natural and laboratory
conditions using surgically implanted temperature loggers. Under both conditions, robust
daily T b rhythmicity with parameters comparable to those of other ground squirrel species
was observed before but not during hibernation. Euthermic animals had robust daily T b
rhythms with a mean of 37.0° C and a range of excursion of approximately 4° C. No T b …