The wrentit (''Chamaea fasciata'') is a small

bird Birds are a group of warm-blooded vertebrates constituting the class (biology), class Aves (), characterised by feathers, toothless beaked jaws, the Oviparity, laying of Eggshell, hard-shelled eggs, a high Metabolism, metabolic rate, a fou ...

that lives in

chaparral Chaparral ( ) is a shrubland plant plant community, community found primarily in California, southern Oregon, and northern Baja California. It is shaped by a Mediterranean climate (mild wet winters and hot dry summers) and infrequent, high-intens ...

, oak woodlands, and bushland on the western coast of

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

. It is the only species in the

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

''Chamaea''. Its

systematics Systematics is the study of the diversification of living forms, both past and present, and the relationships among living things through time. Relationships are visualized as evolutionary trees (synonyms: phylogenetic trees, phylogenies). Phy ...

have been the subject of much debate, the wrentit having been placed in many different

families Family (from ) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictability, structure, and safety as ...

by different authors for as long as it has been known to science. Its common name reflects the uncertainty, and its external resemblance to both tits and

wren Wrens are a family, Troglodytidae, of small brown passerine birds. The family includes 96 species and is divided into 19 genera. All species are restricted to the New World except for the Eurasian wren that is widely distributed in the Old Worl ...

s. It is not related to either, however. More recent and comprehensive phylogenetic studies support it belonging to the

parrotbill The parrotbills are a family, Paradoxornithidae, of passerine birds that are primarily native to East, Southeast and South Asia, with a single species in western North America, though feral populations exist elsewhere. They are generally small ...

Description

The wrentit is a small, bird with uniform dull olive, brown, or grayish

plumage Plumage () is a layer of feathers that covers a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies and may vary with age classes. Within species, there can b ...

. It has short wings and a long tail often held high (hence the comparison to wrens). It has a short bill and a pale iris. Given its retiring nature and loud voice, the wrentit is more likely to be detected by its call than by sight. The distinct sound that it makes is similar to the sound of a ping-pong ball falling on the table.

Systematics

The wrentit has been variously placed in its own family, the Chamaeidae, or with the

long-tailed tit The long-tailed tit (''Aegithalos caudatus''), also named long-tailed bushtit, is a common bird found throughout Europe and the Palearctic. The genus name ''Aegithalos'' was a term used by Aristotle for some European tits, including the long-tail ...

s (Aegithalidae), the true tits and chickadees ( Paridae), the "Old World warblers" (

Sylviidae Sylviidae is a family of passerine birds that includes the typical warblers ''Sylvia'', and closely related genus '' Curruca'', formerly included in ''Sylvia''. They are found in Eurasia and Africa, with the greatest diversity in the Mediterrane ...

), and with the "Old World babblers" ( Timaliidae). The

American Ornithologists' Union The American Ornithological Society (AOS) is an ornithological organization based in the United States. The society was formed in October 2016 by the merger of the American Ornithologists' Union (AOU) and the Cooper Ornithological Society. Its ...

places the wrentit in the latter family, giving it the distinction of being the only babbler known from the

New World The term "New World" is used to describe the majority of lands of Earth's Western Hemisphere, particularly the Americas, and sometimes Oceania."America." ''The Oxford Companion to the English Language'' (). McArthur, Tom, ed., 1992. New York: ...

. This is based on

DNA–DNA hybridization In genomics, DNA–DNA hybridization is a molecular biology technique that measures the degree of genetic similarity between DNA sequences. It is used to determine the genetic distance between two organisms and has been used extensively in phylo ...

studies, which are

phenetic In biology, phenetics (; ), also known as taximetrics, is an attempt to classify organisms based on overall similarity, usually with respect to Morphology (biology), morphology or other observable traits, regardless of their phylogeny or evoluti ...

, however, and therefore not considered methodologically adequate today. Through

DNA sequence A nucleic acid sequence is a succession of bases within the nucleotides forming alleles within a DNA (using GACT) or RNA (GACU) molecule. This succession is denoted by a series of a set of five different letters that indicate the order of the nu ...

analysis, it was subsequently discovered that the wrentit was more closely allied to '' Sylvia'' warblers and some aberrant "babblers". These consequently must be placed in the family

together with the wrentit and the

s which also turned out to be close relatives. Thus, the wrentit is the only American species of the "true" or sylviid warblers. Peculiarly, the

Dartford warbler The Dartford warbler (''Curruca undata'') is a typical warbler from the warmer parts of western Europe and northwestern Africa. It is a small warbler with a long thin tail and a thin pointed bill. The adult male has grey-brown upperparts and is d ...

and close relatives like Marmora's warbler bear an uncanny resemblance to the wrentit; their ecology is quite similar indeed, as all are birds of Mediterranean scrub. However,

biogeography Biogeography is the study of the species distribution, distribution of species and ecosystems in geography, geographic space and through evolutionary history of life, geological time. Organisms and biological community (ecology), communities o ...

and the molecular data build a strong case for this similarity being a case of

convergent evolution Convergent evolution is the independent evolution of similar features in species of different periods or epochs in time. Convergent evolution creates analogous structures that have similar form or function but were not present in the last comm ...

between birds that are close relatives but by far not as close as their appearance would suggest. Alice Cibois suggested that as some babblers are closer to typical warblers than these are to marsh-warblers for example, the Sylviidae should be merged into the Timaliidae. As such an abolishing of the

senior synonym In taxonomy, the scientific classification of living organisms, a synonym is an alternative scientific name for the accepted scientific name of a taxon. The botanical and zoological codes of nomenclature treat the concept of synonymy differently. ...

would require a formal

International Commission on Zoological Nomenclature The International Commission on Zoological Nomenclature (ICZN) is an organization dedicated to "achieving stability and sense in the scientific naming of animals". Founded in 1895, it currently comprises 26 commissioners from 20 countries. Orga ...

ruling and the typical warblers and relatives are still a

monophyletic In biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of organisms which meets these criteria: # the grouping contains its own most recent co ...

group at present, this proposal is not advanced by most researchers until the remaining Sylviidae and Timaliidae genera are studied as regards their relationships. In 2019, a major taxonomic revision of species formerly classified as "babblers" recovered ''Chamaea'' as being most closely allied with the

s and fulvettas, which are otherwise an exclusively Asian group. Due to their phylogenetic and morphological distinctiveness, the family

Paradoxornithidae The parrotbills are a family, Paradoxornithidae, of passerine birds that are primarily native to East, Southeast and South Asia, with a single species in western North America, though feral populations exist elsewhere. They are generally smal ...

was revived for this group, including the wrentit.

Distribution

The wrentit is a sedentary (non- migratory) resident of a narrow strip of coastal habitat along the western coast of

, being found from

Oregon Oregon ( , ) is a U.S. state, state in the Pacific Northwest region of the United States. It is a part of the Western U.S., with the Columbia River delineating much of Oregon's northern boundary with Washington (state), Washington, while t ...

south through

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

, to

Baja California Baja California, officially the Free and Sovereign State of Baja California, is a state in Mexico. It is the northwesternmost of the 32 federal entities of Mexico. Before becoming a state in 1952, the area was known as the North Territory of B ...

, the northern state of the Baja California peninsula. It is usually restricted to certain chaparral and woodland

habitat In ecology, habitat refers to the array of resources, biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species' habitat can be seen as the physical manifestation of its ...

s. It nests in high shrubs such as

poison oak Poison oak refers to two plant species in the genus '' Toxicodendron,'' both of which can cause skin irritation: *'' Toxicodendron diversilobum'' or Pacific poison oak, found in western North America *'' Toxicodendron pubescens'' or Atlantic po ...

(''Toxicodendron diversilobum''), coyote bush (''Baccharis pilularis'') and California blackberry (''Rubus ursinus''). Logging and other changes in habitat have led to this species expanding its range recently, particularly northwards.

Ecology

Wrentits mate for life, forming pair bonds only a few months after hatching. Both sexes sing; the faster rhythm of the male's song is one of the few ways to differentiate the sexes. Both sexes also defend their territory year-round and participate in building the nest, a four-stage process that takes about two weeks. The three or four eggs are incubated for 14 days, again by both sexes. The chicks

fledge Fledging is the stage in a flying animal's life between egg, hatching or birth and becoming capable of flight. This term is most frequently applied to birds, but is also used for bats. For altricial birds, those that spend more time in vulnera ...

after 15 days (at which stage they are unable to fly) and are fed by their parents for another 40 days. The wrentit feeds by skulking through dense scrub

gleaning Gleaning is the act of collecting leftover crops in the field after harvest. During harvest, there is food that is left or missed often because it does not meet store standards for uniformity. Sometimes, fields are left because they were not ec ...

exposed insects found by sight. It feeds primarily on

beetle Beetles are insects that form the Taxonomic rank, order Coleoptera (), in the superorder Holometabola. Their front pair of wings are hardened into wing-cases, elytra, distinguishing them from most other insects. The Coleoptera, with about 40 ...

caterpillar Caterpillars ( ) are the larval stage of members of the order Lepidoptera (the insect order comprising butterflies and moths). As with most common names, the application of the word is arbitrary, since the larvae of sawflies (suborder ...

s, bugs, and

ant Ants are Eusociality, eusocial insects of the Family (biology), family Formicidae and, along with the related wasps and bees, belong to the Taxonomy (biology), order Hymenoptera. Ants evolved from Vespoidea, vespoid wasp ancestors in the Cre ...

s, but also takes small berries and seeds.

References

External links