sperm

Female guppies (Poecilia reticulata) sometimes bring a little extra baggage to a relationship—in the form of a dead male’s sperm. A new study shows that one in four wild guppies in Trinidad and Tobago are fathered by the sperm of dead males. Some of these sperm have been stored for long enough that these males...

Female guppies (Poecilia reticulata) sometimes bring a little extra baggage to a relationship—in the form of a dead male’s sperm. A new study shows that one in four wild guppies in Trinidad and Tobago are fathered by the sperm of dead males. Some of these sperm have been stored for long enough that these males...