| Spanish | English |
| abeto rojo | spruce (Picea abies, Picea excelsa) |
| alerta roja | red flag warning |
| alga roja coralina | coralline red algae |
| algas rojas | red seaweeds (Rhodophyceae) |
| fango rojo | red mud |
| humo rojo | iron-oxide smoke |
| jilguero rojo | red siskin (Carduelis cucullata) |
| lista roja | red list |
| lista roja | red list The series of publications produced by the International Union for the Conservation of Nature and Natural Resources (IUCN). They provide an inventory on the threat to rare plants and animal species. Information includes status, geographical distribution, population size, habitat and breeding rate. The books also contain the conservation measures, if any, that have been taken to protect the species. There are five categories of rarity status: endangered species; vulnerable organisms, which are those unlikely to adapt to major environmental effects; rare organisms, which are those at risk because there are few of them in the world, such as plants which only grow on mountain peaks or on islands; out of danger species, which were formerly in the above categories, but have had the threat removed because of conservation actions; and indeterminate species, which are the plants and animals probably at risk, although not enough is known about them to assess their status |
| Lista Roja de Animales Amenazados | Red List of Threatened Animals |
| Lista roja de residuos | Red list of wastes |
| lodos rojos | red sludge |
| lodos rojos | red mud |
| Lodos rojos de la producción de alúmina | red mud from the alumina production |
| loro de cara roja | red-spectacled parrot (Amazona petrei, Amazona pretrei) |
| loro de cara roja | red-spectacled amazon (Amazona petrei, Amazona pretrei) |
| loro de panda roja | Puerto Rico parrot (Amazona vittata) |
| loro de panda roja | red-fronted amazon (Amazona vittata) |
| loro de panda roja | Puerto Rican parrot (Amazona vittata) |
| loro de panda roja | Puerto Rican amazon (Amazona vittata) |
| marea roja | red tide |
| marea roja | red tide Sea water which is covered or discoloured by the sudden growth of algal bloom or by a great increase in single-celled organisms, dinoflagellates. Red tides are often fatal to many forms of marine life and, in some cases, can result in human deaths because the dinoflagellates are eaten by clams and mussels which concentrate the paralysing toxins which they produce |
| wallabi rojo | wurrup (Lagorchestes hirsutus) |
| wallabi rojo | ormala (Lagorchestes hirsutus) |
| wallabi rojo | rufous (Lagorchestes hirsutus) |
| wallabi rojo | Western hare-wallaby (Lagorchestes hirsutus) |
