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doi: 10.1038/064126f0
TO-DAY the Cape viper (Causus rhombeatus) laid several eggs. The keeper says this has happened before. As Causus is one of the Viperidae, and as the Viperidae (except Atractaspis) are, as their name implies, viviparous, or, to be accurate, ovo-viviparous, it would be interesting to know whether this is a freak, or whether the Causidae are oviparous in their native state.
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