 Modern frigatebirds show pronounced sexual dimorphism in size, apparently to avoid competition due to different soaring behavior of male and female wings.As "Limnofregata" was most likely not a soaring bird, it can be expected that the sexes were much alike.It is not known if the males had a prominent throat balloon for advertising for mates as in their modern relatives, but "Limnofregata" throat bones differ markedly from those of modern frigatebirds.