Cravina

About

The Cravina (Sporophila pileata) is a small, sexually dimorphic seed-finch belonging to the family Thraupidae. Males are strikingly patterned with a black cap, white collar, and rufous underparts, while females are much plainer. It is primarily granivorous, feeding on grass seeds, and inhabits open grasslands and savannas, often near water. This species is known for its melodious song.

Size & lifespan

Length

9.5-10.5 cm

Wingspan

14-16 cm

Weight

7-9 g

Lifespan

3-5 years in the wild (estimated)

Diet

Granivore (primarily grass seeds)

Physical characteristics

Plumage

Adult male: Distinctive black cap extending to the nape, contrasting with a broad white collar that wraps around the hindneck and sides of the neck. The back and wings are dark gray to blackish. Underparts are a rich rufous-chestnut, fading to whitish on the lower belly and undertail coverts. A small white patch is often visible at the base of the primaries on the folded wing. Adult female: Overall dull olive-brown to yellowish-brown, paler on the underparts, often with a faint yellowish wash on the belly. Lacks any strong markings. Immature male: Resembles the female, gradually acquiring adult male plumage over several months, often showing a mottled appearance with patches of black and rufous.

Beak shape

Conical, stout, and relatively short, adapted for cracking seeds. Color is typically dark gray to black in males, and horn-colored to grayish in females and immatures.

Eye color

Dark brown.

Leg color

Dark gray to blackish.

Distinguishing features

Male's black cap, white collar, and rufous underparts are unmistakable. Female's plain olive-brown plumage can be challenging but is consistent with other female Sporophila, requiring careful observation of size and habitat.

Juvenile appearance

Juveniles of both sexes resemble adult females, being dull olive-brown. Young males gradually develop adult male plumage, often showing a patchy transition.

Seasonal changes

No significant seasonal plumage changes in adults. Breeding and non-breeding plumages are essentially the same for both sexes.

Sexual dimorphism

Pronounced. Males are brightly colored with a black cap, white collar, and rufous underparts. Females are dull olive-brown.

How to identify

1. 1

   Male Plumage

   Look for the striking combination of a black cap, broad white collar, and rich rufous underparts. This pattern is unique among Sporophila species.

2. 2

   Female/Immature Plumage

   Females and immatures are dull olive-brown. Identification is challenging and often relies on association with a singing male, habitat, or subtle vocal differences. Look for a generally warmer, slightly more yellowish-brown tone compared to some other female seedeaters.

3. 3

   Song

   Learn the male's melodious, varied, and sweet whistling song. It's a key identification feature, especially for distinguishing females and immatures in the field.

4. 4

   Habitat

   Cravinas prefer tall, undisturbed grasslands and savannas, often near water. Observing the bird in this specific habitat can aid in identification.

Habitat & range

Biomes

Grasslands, savannas, open fields, pastures, agricultural areas, and marsh edges.

Geographic range

Primarily central and southeastern Brazil (from Goiás and Minas Gerais south to Rio Grande do Sul), eastern Paraguay, and northeastern Argentina (Misiones, Corrientes). There are also isolated records from Bolivia and Uruguay.

Elevation range

Typically found from sea level up to approximately 1,000 meters (3,300 feet).

Preferred environments

Prefers tall, undisturbed grasslands with abundant seeding grasses, often near water sources such as marshes, ponds, or rivers. Also found in disturbed areas like pastures and agricultural fields, especially those with native grass patches.

Behavior

Activity time

Diurnal, most active during the early morning and late afternoon.

Feeding habits

Primarily granivorous, feeding almost exclusively on small grass seeds. They forage on the ground or cling to grass stems to extract seeds directly from the seed heads. Occasionally consumes small insects, especially during the breeding season to supplement protein for chicks.

Social behavior

Usually seen singly or in pairs during the breeding season. Outside of breeding, they may form small, loose flocks, sometimes associating with other Sporophila species.

Flight pattern

Typically short, undulating flights between grass patches or low perches. When flushed, they fly low over the vegetation for a short distance before dropping back into cover.

Migration pattern

Considered a partial migrant or austral migrant. Populations in the southern parts of its range (e.g., southern Brazil, Argentina, Paraguay) may move north during the austral winter, while northern populations may be more resident or undertake local movements.

Territoriality

Males are territorial during the breeding season, defending a small area around the nest site and singing from prominent perches to attract mates and deter rivals.

Breeding & reproduction

Breeding season

Typically October to March in the southern parts of its range, coinciding with the rainy season and peak grass seed availability.

Nesting habits

Nests are small, cup-shaped structures, meticulously woven from fine grass stems, rootlets, and spider silk. They are usually placed low in dense grass or small shrubs, well-concealed. Both parents participate in nest construction.

Clutch size

2-3 eggs.

Egg description

Eggs are typically whitish or pale greenish-blue, sparsely marked with fine reddish-brown or purplish spots and speckles, often concentrated at the larger end. Approximately 16 x 12 mm.

Incubation period

Approximately 11-13 days, primarily by the female.

Fledging period

Chicks fledge about 10-12 days after hatching. Both parents feed the young.

Parental care

Both male and female participate in feeding the nestlings and fledglings. The male often continues to feed the fledglings while the female may begin a second clutch.

Where to find

Field tips

1. Listen for the Song. The male's song is often the first indication of its presence. Learn to recognize it to locate individuals, especially in dense grass.
2. Scan Grass Tops. Males often perch conspicuously on the tops of tall grass stems or low shrubs to sing and survey their territory. Use binoculars to scan these areas.
3. Be Patient and Observe. These are small, often secretive birds. Patience is key. Once located, observe their feeding behavior and movements within the grass.
4. Visit During Breeding Season. Males are most vocal and conspicuous during the breeding season (austral spring/summer), making them easier to find.

Similar species

Quick facts

Family:

Thraupidae (Tanagers and allies)

Diet:

Grass seeds

Conservation Status:

Near Threatened

Male Plumage:

Black cap, white collar, rufous underparts

Female Plumage:

Dull olive-brown

Habitat:

Grasslands, savannas, open fields

Fun facts

• The name 'Cravina' in Portuguese refers to the 'carnation' flower, possibly alluding to the male's striking colors or its melodious song.
• Like many seedeaters, the Cravina's population is highly dependent on the availability of specific grass seeds, making it vulnerable to habitat alteration and agricultural practices.
• The genus Sporophila means 'seed-lover' in Greek, accurately reflecting their primary diet.
• Despite its small size, the male Cravina's song is surprisingly loud and far-carrying, a common trait among seedeaters used to attract mates in open habitats.

Scientific classification

Kingdom

Animalia

Phylum

Chordata

Class

Aves

Order

Passeriformes

Family

Thraupidae

Genus

Sporophila

Species

Sporophila pileata

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