[order] PASSERIFORMES | [family] Thraupidae | [latin] Oryzoborus crassirostris | [UK] Large-billed Seed-Finch | [FR] Grainetier des rizieres | [DE] Mohren-Reisknacker | [ES] Semillero Rastrojero | [NL] Dikbekzaadkraker
Subspecies
| Genus | Species | subspecies | Breeding Range | Breeding Range 2 | Non Breeding Range |
Physical charateristics
The bird is almost entirely black, with a large whitish bill and a prominent small white speculum on the bend of the wing. The female is almost entirely brown and buff below.
Listen to the sound of Large-billed Seed-Finch
[audio:http://www.aviflevoland.nl/sounddb/L/Large-billed Seed-Finch.mp3]
Copyright remark: Most sounds derived from xeno-canto
| wingspan min.: | 0 | cm | wingspan max.: | 0 | cm |
| size min.: | 14 | cm | size max.: | 16 | cm |
| incubation min.: | 0 | days | incubation max.: | 0 | days |
| fledging min.: | 0 | days | fledging max.: | 0 | days |
| broods: | 1 | eggs min.: | 2 | ||
| eggs max.: | 3 |
Range
South America : North South America from West Colombia and Northwest Ecuador to North Brazil
Habitat
Its natural habitats are subtropical or tropical moist shrubland, swamps, and heavily degraded former forest. It has a patchy distribution in freshwater marshes, riparian thickets and second-growth scrub, mostly below 500 m but it has been recorded to 700 m. Although much of its habitat appears to be intact, the principal threat is the depletion of local populations by bird trappers.
Reproduction
The nest is an open cup made of grass and small twigsl. It is built in low shrubbery and clutch size is 2-3 eggs.
Feeding habits
Mainly grass seeds.
Conservation
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
Oryzoborus crassirostris is uncommon and local in north and east Colombia (in humid Caribbean lowlands west to Cordoba and locally east of the Andes), where it may be expanding its range following deforestation, Venezuela (not recorded from the north-west or from most of the Ilanos region), Guyana, Suriname, French Guiana, Amazonian Brazil (south only to the Amazon), and north-east Peru (Loreto to Huanuco); it is also extremely rare and possibly extirpated on Trinidad, Trinidad and Tobago. The Twatwa has become a rare bird in Suriname because of wide-spread trapping
Oryzoborus crassirostris is uncommon and local in north and east Colombia (in humid Caribbean lowlands west to Cordoba and locally east of the Andes), where it may be expanding its range following deforestation, Venezuela (not recorded from the north-west or from most of the Ilanos region), Guyana, Suriname, French Guiana, Amazonian Brazil (south only to the Amazon), and north-east Peru (Loreto to Huanuco); it is also extremely rare and possibly extirpated on Trinidad, Trinidad and Tobago. The Twatwa has become a rare bird in Suriname because of wide-spread trapping
Migration
Sedentary throughout range
Distribution map
