Flatworm Species Can Stab Its Head With Needle-Like Penis and Inject Sperm to Reproduce

Flatworm Species Can Stab Its Head With Needle-Like Penis and Inject Sperm to Reproduce

Scientists have found a species of flatworm that has an interesting needle-like penis that can stab its own head to inject sperm in order to reproduce when a female companion is not available during mating season. According to a new study conducted by researchers from the University of Basel in Switzerland and the University of Bielefeld in Germany, the Macrostomum […]