Live-birth in vipers (Viperidae) is a key innovation and adaptation to global cooling during the Cenozoic.

Abstract excerpt

The identification of adaptations and key innovations has long interested biologists because they confer on organisms the ability to exploit previously unavailable ecological resources and respond to novel selective pressures. Although it can be extremely difficult to test for the effects of a character on the rate of lineage diversification, the convergent evolution of a character in multiple lineages provides...

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