|Paroaria gularis at Bird Kingdom, Niagara Falls|
|Family:||Thraupidae (and see text)|
The genus Paroaria is classified in the family Thraupidae, unlike the cardinals proper which are in the Cardinalidae. They were long believed to be closer to American sparrows and placed in the Emberizidae. 
The Masked Cardinal was formerly considered conspecific with the Red-capped Cardinal. The Masked Cardinal markedly differs from the Red-capped Cardinal by the black ear-coverts and the red (not black) lower throat and upper chest. Additionally, its lower mandible is typically whitish, but this is not entirely consistent, as it occasionally is pale flesh-coloured. This distinctive taxon was determined a different species, as suggested by the lack of hybridization with P. g. gularis in the limited area of overlap in southern Venezuela.
- Paroaria gularis gularis (Linnaeus, 1766) (eastern Colombia to eastern Peru and through the Guianas to central Brazil)
- Paroaria gularis cervicalis Sclater, PL, 1862 (North East Bolivia and South West Brazil
The adult Red-capped Cardinal is 16.5 cm (6.5 in) long and weighs about 22 g. (0.78 oz). The nominate subspecies has a crimson head, blackish lores and ocular region, and shiny black upperparts, apart from a white partial collar extending up the neck sides from the white underparts. The throat is black, extending to a point on the upper chest. The upper mandible is black, while the lower is pale flesh-coloured. The legs are dark grey (almost black) and the iris is brownish-orange. In pattern the juvenile resemble the adults, but the upperparts are dusky-brown, the head is deep brownish-buff (darker on the cap), the bill is entirely black and the iris is pale, dull creamy-yellow.
The song is a variable, often repeated series of suweet-chu notes, and the call is a sharp chep.
It occurs in lowlands of the Guianas, Venezuela, eastern Colombia, eastern Ecuador, eastern Peru, northern and eastern Bolivia and the Amazon basin in Brazil. In Brazil it is, except for populations in the relatively open lowlands of north-eastern Roraima and along the Branco River and lower Rio Negro, apparently largely absent from the regions north of the northern bank of the Amazon River, but these regions are generally very poorly known and its presence cannot be discounted, especially in the section between the lower Rio Negro and Rio Jari (the river on the border between Pará and Amapá).
This is a bird of swamps, mangrove, Várzea and other semi-open areas near water. It is generally common, and even occur in lightly wooded wet habitats in towns or cities (e.g. Manaus and Puerto Maldonado).
The Red-capped Cardinal feeds on insects, rice and fruit. It is usually found in conspicuous pairs or family groups. If there is a well-marked breeding season, it extends over much of the year. The Red-capped Cardinal has been recorded to breed at least from June to September in northern South America but at Sacha Lodge at the Napo River (Ecuador) an adult was seen feeding a fledgling Shiny Cowbird (a brood parasite of the Red-capped Cardinal) in late March. This suggests that breeding can also occur as early as February/March. There is no indication for a difference in breeding seasons between the Red-capped and the Masked Cardinals.
They build a shallow open cup nest, some 9–10 cm wide and 7 cm high outside with a 7 cm wide by 4 cm deep cup, in a tree or some other secure spot. For nest material, it uses rootlets, thin twigs, and ferns. The clutch is two or three eggs. These have a background colour varying between whitish and dull olive and have dense dark brown flecks and blotches, heavier at the blunt end. They measure about 21-22 by 16 mm. This species is parasitised by the Shiny Cowbird (Molothrus bonariensis).
- BirdLife International (2012). "Paroaria gularis". IUCN Red List of Threatened Species. Version 2012.1. International Union for Conservation of Nature. Retrieved 16 July 2012.
- IOC World Bird Names VERSION 2.11.
- Restall et al. (2006).
- Greeney et al. (2004), Greeney & Merino M. (2006)
- In Ecuador, a nest in the Cuyabeno Faunistic Reserve was built in the roots of a Macrolobium sp. standing in water (Greeney & Merino M. 2006), while one at Sacha Lodge was 4 metres above ground in a tree (Greeney et al. 2004)
- E.g. Microgramma (Greeney & Merino M. 2006)
- ffrench, Richard; O'Neill, John Patton & Eckelberry, Don R. (1991): A guide to the birds of Trinidad and Tobago (2nd edition). Comstock Publishing, Ithaca, N.Y. ISBN 0-8014-9792-2
- Greeney, Harold F. & Merino M., Paúl A. (2006): Notes on breeding birds from the Cuyabeno Faunistic Reserve in northeastern Ecuador. Boletín de la Sociedad Antioqueña de Ornitología 16 (2): 46–57. PDF fulltext
- Greeney, Harold F.; Gelis, Rudolphe A. & White, Richard (2004): Notes on breeding birds from an Ecuadorian lowland forest. Bulletin of the British Ornithologists' Club 124 (1): 28–37. PDF fulltext
- Hilty, Steven L. (2003): Birds of Venezuela. Christopher Helm, London. ISBN 0-7136-6418-5
- Restall, Robin L.; Rodner, C. & Lentino, M. (2006): Birds of Northern South America. Christopher Helm, London. ISBN 0-7136-7243-9 (vol. 1). ISBN 0-7136-7242-0 (vol. 2).