The Tres Marías archipelago off western Mexico, is currently considered to have 24 endemic subspecies of landbirds. In a recent paper , Héctor Gómez de Silva, Mónica G.Pérez Villafaña, Javier Cruz-Nieto and Miguel Ángel Cruz-Nieto, propose that six of these subspecies should be elevated to endemic species.
- Cynanthus lawrencei
- Amazilia graysoni
- Forpus insularis
- Pheugopedius lawrencii
- Icterus graysonii
- Granatellus francescae
They based their conclusion on new and previously overlooked information.
 H. G. de Silva, M. G. P. Villafaña, J. Cruz-Nieto, en M. Á. Cruz-Nieto, ‘Are some of the birds endemic to the Tres Marías Islands (Mexico) species?’, Bull. Br. Ornithol. Club, vol. 140, nr. 1, pp. 7–37, mrt. 2020, doi: 10.25226/bboc.v140i1.2020.a3.