Pregnant female guppies have enlarged and darkened gravid spots near their anal vents. Gravid hysterectomy refers to removal of the whole uterus while still containing the pregnancy. Gravid proglottids often rupture in the intestine, liberating the oncospheres in faeces. Gravid females responded most positively to green and blue/green colors for oviposition. Gravid females carry between two and twenty eggs. Associated terms for pregnancy are "gravid" and "parous". In the gravid proglottid, the uterus contains up to 15 side branches filled with eggs. The abdomen of a gravid female can be more than in diameter. Only the male frogs are able to produce mating calls to attract gravid female frogs. Furthermore, gravid females will not oviposit during overcast or rainy weather. This shortens the potential turn around between egg-laying events in gravid females. There is much variation in female size, particularly in egg-carrying (gravid) females. Gravid females may change their color to fit their background. Unlike in other "Taenia", gravid proglottids are shed individually. The smallest gravid female measured was .