Aren't mouthbrooders sexy? Rueger et al. find that sexual selection in the pajama cardinalfish, where fathers brood eggs in their mouth, changes with group size and composition. Both sexes can take advantage of extra-pair matings. Read now ahead of print!
https://www.journals.uchicago.edu/doi/10.1086/731422

#mouthbrooders #sexualSelection #pajamaCardinalfish #eggs #cardinalfish