Semnornis Richmond, 1900
* Richmond, 1900. The Auk 17 p.179
The toucan-barbets are the small bird genus Semnornis. This was often included in the paraphyletic barbets but recently usually considered a distinct family Semnornithidae; alternatively, all barbets might be moved to the toucan family Ramphastidae as a subfamily, Semnornithinae. It contains only two species.
The Semnornis toucan-barbets are found in the Neotropics. The Prong-billed Barbet is restricted to the humid highland forests of Costa Rica and Panama. The Toucan-barbet is found in similar habitats in the western montane forests of Ecuador and Colombia. In addition to primary forest they may occupy forest edges and secondary growth. Neither species is migratory, and young birds do not appear to disperse very far after fledging; young Toucan-barbets only disperse 0.5 km.
The Semnornis barbets are fairly large barbets, measuring between 18-21 cm. The Toucan-barbet is larger than the Prong-billed Barbet and considerably heavier. The possess large, swollen bills and lack strong sexual dimorphism in their plumage. The plumage of the Prong-billed Barbet is orang-brown, and that of the Toucan-barbet is more distinctively patterned with black, red, grey and gold.
The Semnornithidae are highly social, and may bee seen either in small groups of up to five or six individuals, or as singles. They are active during the day and are early risers. The Prong-billed Barbet sleeps in communal roosts at night in the non-breeding season. As many as 19 birds may roost together in a hole, either a modified nest or the abandoned nest of a woodpecker. During the breeding season pairs roost in their own nests.
Diet and feeding
The diet of these two species are made up of fruits and insects. The ratio of the two is more similar to the toucans than other barbets and is predominated by fruits. A 1993 of the stomach contents of these two species found that in all the stomachs checked only fruit was found. Fruits may be eaten whole, held in the foot and broken and eaten, or crushed and only the juices eaten. Insects are more common in the diet of nestlings, and compose 40% of the food brought to the nest in Toucan-barbets. Toucan-barbets may also feed their chicks small numbers of vertebrates.They have also been recorded eating flowers.
Both species of toucan-barbet are monogamous breeders. The Prong-billed Barbets defend breeding territories from all others of their species. Toucan-barbets, on the other hand, are have territories but are helped in raising the young by helpers.
* Prong-billed Barbet, Semnornis frantzii
1. ^ Richmond, Chas (1899). "New Name for the Genus Tetragonops". Auk 16 (1): 77. http://elibrary.unm.edu/sora/Auk/v016n01/p0077-p0077.pdf.
* Edinburgh new philosophical journal, (New series) 2 no.2 p.404
Source: Wikipedia, Wikispecies: All text is available under the terms of the GNU Free Documentation License