Reproductive frequency in captive and wild-caught female Tiliqua nigrolutea was examined over five consecutive reproductive seasons. Reproductive frequency (0.38 ± 0.035) was clearly different from an annual pattern of 1.0 (i.e. all females reproducing every year). Individual females did not reproduce every year, but "skipped" seasons were staggered such that a proportion of the population produced a clutch each season. Skipped reproductive opportunities are attributed to a combination of a

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... gestation, high relative clutch mass (0.43 ± 0.034), parturition late in the active season, a cessation of feeding in the latter stages of gestation and low autumn temperatures limiting post-partum feeding opportunities.