From ducks to dolphins, females have developed sex organs that help them deter undesirable suitors and derive pleasure from non-reproductive behavior Rachel E. Gross Biologists of the past often ...

Add Yahoo as a preferred source to see more of our stories on Google. Cute loving couple of colorful ducks. Mandarin duck Aix galericulata female and male. Loving birds, animal love. Smooth background ...

Sperm Storage Tubules (SSTs) allow female ducks to store sperm for extended periods, decoupling insemination from fertilization and enabling delayed fertilization. Female ducks have more control over ...