* Uses 2-3 billion sperm per insemination (60 billion in a normal ejaculate), so is relatively inefficient only giving ~20 inseminations per [[Reproductive_Behaviour_-_Copulatory_Behaviour_- Anatomy & Physiology#Ejaculation|ejaculate]]. | * Uses 2-3 billion sperm per insemination (60 billion in a normal ejaculate), so is relatively inefficient only giving ~20 inseminations per [[Reproductive_Behaviour_-_Copulatory_Behaviour_- Anatomy & Physiology#Ejaculation|ejaculate]]. |