Breeding birds of riparian forests and other habitats in the Ciudad Victoria area were studied, mainly in June 2003 and 2006. Olivaceous woodcreeper (Sittasomus griseicapillus), mangrove swallow (Tachycineta albilinea), and scrub euphonia (Euphonia affinis; nesting) extended their range north to the Ciudad Victoria area. Western kingbird (Tyrannus verticalis) nested for the first time in Tamaulipas and occurred south to the Ciudad Victoria area, and European starlings (Sturnus vulgaris) nested in south-central Tamaulipas for the first time. Great curassow (Crax rubra) and crested guan (Penelope purpurascens) were rediscovered in the Ciudad Victoria area for the first time since 1909. Distributions of many species in the state of Tamaulipas are changing, as tropical species move north and temperate-zone species move south.