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4. REFERENCES for fecundity-independent costs. Physiol. Biochem. Zool. 76: 497-510. Fregoso, S.P., Stewart, J.R. & Ecay, T.W. 2010. Embry- onic mobilization of calcium in a viviparous reptile: Evi- dence for a novel pattern of placental calcium secretion. Comp. Biochem. Phys. Part A 156(1): 147-150. Molyneux, A. 2017. Personal interview with a major Tili- qua collector in USA. June 7, 2017. Ladyman, M., Bonnett, X., Lourdais, O., Bradshaw, D. & Naulleau, G. 2003. Gestation, thermoregulation, and metabolism in a viviparous snake, Vipera aspis: evidence Shine, R. 1980. “Costs” of reproduction in reptiles. Oecologia 46(1): 92-100. 2 qtr page ad