Bothrops jararacussu shares several reproductive traits with its congeners (e.g., obligatory female sperm storage). However, we found that this species exhibits some unique characteristics, such as one of the highest female-biased sexual size dimorphism in snakes and one of the largest litter size in the genus, which we interpret as the result of a strong selection for increased fecundity. Another peculiarity found in this species is the prolonged activity of the sexual segment of the kidney, which suggests that males prolong their potential to mate.
