Semen collection and evaluation in free-ranging Brazilian Rattlesnakes (Crotalus durissus terrificus) - Zacariotti, Rogério Loesch; Grego, Kathleen Fernandes; Fernandes, Wilson; Sant'Anna, Sávio Stefanini; Guimarães, Marcelo Alcindo de Barros Vaz (Zoo Biology, 2007)