In this study, we explored the factors underlying species prioritization in biodiversity conservation policies. Specifically, we analyzed: scientific research, public opinion, and endangered species lists, both non-binding (Red Lists) and legal listing (National Catalogue of Endangered Species). Our results shown that there was a strong correlation among conservation priority species, species aimed of research, and species preferred by society. Thus, these factors combine in a positive feedback to create a sort of conservation pitfall trap, in which few species are considered as conservation priorities, relegating those species which have a key role on ecosystems, taxonomic singularity, or with high probability of successful conservation programs. Finally, we identified those "advantage" and "invisible" taxonomic groups regarding conservation policies.