Animals 6 Ecosystem 6 animal 6 article 6 ecosystem 6 physiology 6 Anura 4 Argentina 4 Bufonidae 4 Burrows use 4 Female 4 Male 4 Population Density 4 Rhinella fernandezae 4 Rhinophrynidae 4 Sex Ratio 4 Sex ratio 4 Size distribution 4 classification 4 female 4 histology 4 male 4 population density 4 sex ratio 4 toad 4 Behavior, Animal 2 Brachyura 2 Burrow use 2 Conditioning (Psychology) 2 Crab 2