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Body size (snout-vent length [SVL]) and weight of oviparous and viviparous female common lizards (Zootoca vivipara) from the contact zone at Straniger Alm in Austria. Mean and standard error are shown for each panel. Viviparous females are a larger and heavier b before and c after giving birth/egg-laying than oviparous females. The raw data are shown, uncorrected for effects such a body size or duration of captivity
