Fig. 1
From: Experimental evidence for ovarian hypofunction in sparrow hybrids
Comparison of the prevalence of ovarian hypofunction between females of both study species (Spanish sparrows, P. hispaniolensis, and house sparrows, P. domesticus) and their hybrids. a Ovary width and length for both hybrid and pure-species females. Black ellipse encircles individual datapoints which are significant outliers in terms of width and length. b Boxplots showing median, quartiles and 5- and 95-percentiles for ovary volume across hybrid and pure-species individuals. Single data-points indicate extreme observations. c Photograph of a typical (normal) ovary and an atrophied ovary. d Proportion of females exhibiting ovarian atrophy in each category (n is the sample size for each type of female)