Copulatory plugs in snakes: enforced chastity

Science  07 Mar 1975:
Vol. 187, Issue 4179, pp. 844-845
DOI: 10.1126/science.1114329


The male of some snake species forms a copulatory plug which occludes the oviductal parts of the female's cloaca for a few days. The plug, apparently formed from secretions of the kidney immediately after insemination, probably prevents rival males from copulating with the same female.