Grace's warbler (''Setophaga graciae'') is a small

New World warbler The New World warblers or wood-warblers are a group of small, often colorful, passerine birds that make up the family Parulidae and are restricted to the New World. They are not closely related to Old World warblers or Australian warblers. Most ...

that specializes in

pine A pine is any conifer tree or shrub in the genus ''Pinus'' () of the family Pinaceae. ''Pinus'' is the sole genus in the subfamily Pinoideae. The World Flora Online created by the Royal Botanic Gardens, Kew and Missouri Botanical Garden accep ...

woods.

Taxonomy

Grace's warbler was discovered by

Elliott Coues Elliott Ladd Coues (; September 9, 1842 – December 25, 1899) was an American army surgeon, historian, ornithologist, and author. He led surveys of the Arizona Territory, and later as secretary of the United States Geological and Geographic ...

in the

Rocky Mountains The Rocky Mountains, also known as the Rockies, are a major mountain range and the largest mountain system in North America. The Rocky Mountains stretch in straight-line distance from the northernmost part of western Canada, to New Mexico in ...

in 1864. He requested that the new species be named after his 18-year-old sister, Grace Darling Coues, and his request was honored when

Spencer Fullerton Baird Spencer Fullerton Baird (; February 3, 1823 – August 19, 1887) was an American naturalist, ornithologist, ichthyologist, Herpetology, herpetologist, and museum curator. Baird was the first curator to be named at the Smithsonian Institution. He ...

described the species scientifically in 1865.

Description

Grace's warbler is a small bird, 11–13 cm long. It is mostly gray on top, with broken black streaks across the back and flanks and two white bars on the wings. The throat and breast are a vibrant yellow, and the rest of the underparts are white. It has a yellow half-eye ring under the eye and a long yellow "

eyebrow An eyebrow is an area of short hairs above each eye that follows the shape of the lower margin of the brow ridges of some mammals. In humans, eyebrows serve two main functions: first, communication through facial expression, and second, prevent ...

" stripe that starts at the base of the beak and runs above the eye, fading to white after it passes the eye.

Distribution and habitat

Grace's warblers breed from the south-western United States to Nicaragua and winter in their breeding range from north-eastern

Sinaloa Sinaloa (), officially the Estado Libre y Soberano de Sinaloa ( en, Free and Sovereign State of Sinaloa), is one of the 31 states which, along with Mexico City, comprise the Administrative divisions of Mexico, Federal Entities of Mexico. It is d ...

and north-western

Durango Durango (), officially named Estado Libre y Soberano de Durango ( en, Free and Sovereign State of Durango; Tepehuán: ''Korian''; Nahuatl: ''Tepēhuahcān''), is one of the 31 states which make up the 32 Federal Entities of Mexico, situated in ...

south. They are almost always found in pine forests, even in

migration Migration, migratory, or migrate may refer to: Human migration * Human migration, physical movement by humans from one region to another ** International migration, when peoples cross state boundaries and stay in the host state for some minimum le ...

, though at the northern end of their range (in southern

Nevada Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...

and

Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it ...

and southwestern

Colorado Colorado (, other variants) is a state in the Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the western edge of t ...

) they occur in

spruce A spruce is a tree of the genus ''Picea'' (), a genus of about 35 species of coniferous evergreen trees in the family Pinaceae, found in the northern temperate and boreal (taiga) regions of the Earth. ''Picea'' is the sole genus in the subfami ...

fir Firs (''Abies'') are a genus of 48–56 species of evergreen coniferous trees in the family (biology), family Pinaceae. They are found on mountains throughout much of North America, North and Central America, Europe, Asia, and North Africa. The ...

forest. They prefer open, "parklike" woods, and in some areas such as northern

Arizona Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...

they prefer an understory of Gambel's oak. In the United States and northern Mexico they typically occur at altitudes of ); farther south they may occur as low as 250 m. They are common in some localities, and in areas of the

Mosquitia La Mosquitia is the easternmost part of Honduras along the Mosquito Coast, which extends into northeastern Nicaragua. It is a region of tropical rainforest, pine savannah, and marsh that is accessible primarily by water and air. Its population inc ...

of Nicaragua where the only tree is the

Caribbean pine The Caribbean pine (''Pinus caribaea'') is a hard pine species native to Central America and the northern West Indies (in Cuba, the Bahamas, and the Turks and Caicos Islands). It belongs to subsection '' Australes'' in subgenus ''Pinus''. It inha ...

, Grace's warblers may be the only bird seen.Stacier, Cynthia A.; Guzy, Michael J. 2002
Grace's Warbler (''Setophaga graciae'')
''The Birds of North America Online'' (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology. Accessed 2012-03-1

Behaviour and ecology

Breeding

The nesting habits of Grace's warblers are largely unknown, as nests are very rarely found. The nest is a compact cup of plant fibers, the inside lined with hair and feathers, placed high above ground on a tree branch, usually

. The female lays 3 to 5 white or cream-colored eggs, speckled with brown, and ringed at the larger end.

Feeding

Like the vast majority of warblers, Grace's warbler eats only

insect Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen), three pairs ...

s and

spider Spiders ( order Araneae) are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude silk. They are the largest order of arachnids and rank seventh in total species ...

s, as far as is known from limited studies. It forages mostly high in pine trees (86% of its foraging time in a study in Arizona was in pines, but it foraged in oaks more in Mexico where

olive warbler The olive warbler (''Peucedramus taeniatus'') is a small passerine bird. It is the only member of the genus ''Peucedramus'' and the family Peucedramidae. This species breeds from southern Arizona and New Mexico, USA, south through Mexico to Nica ...

s also occur). It catches its food from the bases of needle clusters and the upper bark of branches no thicker than its body. It will often hover to inspect

pine cones A conifer cone (in formal botanical usage: strobilus, plural strobili) is a seed-bearing organ on gymnosperm plants. It is usually woody, ovoid to globular, including scales and bracts arranged around a central axis, especially in conifers ...

for insect larvae. In Arizona it seldom flies to catch insects, but in Nicaragua it often does.

References

External links

Grace's warbler photo gallery
VIRE
Photo-High Res
{{Taxonbar, from=Q27075938 Grace's warbler Native birds of the Southwestern United States Birds of Central America Birds of Mexico Fauna of the Chihuahuan Desert Grace's warbler Grace's warbler Birds of the Sierra Madre Occidental