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 ...
of largely arboreal
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 ...
s make up the
order
Order, ORDER or Orders may refer to:
* A socio-political or established or existing order, e.g. World order, Ancien Regime, Pax Britannica
* Categorization, the process in which ideas and objects are recognized, differentiated, and understood
...
Piciformes (), the best-known of them being the Picidae, which includes the
woodpecker
Woodpeckers are part of the bird family (biology), family Picidae, which also includes the piculets, wrynecks and sapsuckers. Members of this family are found worldwide, except for Australia, New Guinea, New Zealand, Madagascar and the extreme ...
s and close relatives. The Piciformes contain about 71 living
genera
Genus (; : genera ) is a taxonomic rank above species and below family as used in the biological classification of living and fossil organisms as well as viruses. In binomial nomenclature, the genus name forms the first part of the binomial s ...
with a little over 450
species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
, of which the Picidae make up about half.
In general, the Piciformes are insectivorous, although the barbets and
toucan
Toucans (, ) are Neotropical birds in the family Ramphastidae. They are most closely related to the Semnornis, Toucan barbets. They are brightly marked and have large, often colorful Beak, bills. The family includes five genus, genera and over ...
s mostly eat fruit and the
honeyguide
Honeyguides (family (biology), family Indicatoridae) are a family of birds in the order Piciformes. They are also known as indicator birds, or honey birds, although the latter term is also used more narrowly to refer to species of the genus ''Pro ...
s are unique among birds in being able to digest
beeswax
Bee hive wax complex
Beeswax (also known as cera alba) is a natural wax produced by honey bees of the genus ''Apis''. The wax is formed into scales by eight wax-producing glands in the abdominal segments of worker bees, which discard it in o ...
(although insects make up the bulk of their diet). Nearly all Piciformes have parrot-likezygodactyl feet—two toes forward and two back, an arrangement that has obvious advantages for birds that spend much of their time on tree trunks. An exception are a few
species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
of three-toed woodpeckers. The
jacamar
The jacamars are a family, Galbulidae, of birds from tropical South and Central America, extending up to Mexico. The family contains five genera and 18 species. The family is closely related to the puffbirds, another Neotropical
The Neotro ...
s aside, Piciformes do not have
down feather
The down of birds is a layer of fine feathers found under the tougher exterior feathers. Very young birds are clad only in down. Powder down is a specialized type of down found only in a few groups of birds. Down is a fine thermal insulator and p ...
s at any age, only true feathers. They range in size from the rufous piculet at 8 centimetres in length, and weighing 7 grams, to the
toco toucan
The toco toucan (''Ramphastos toco'') is a species of bird in the toucan Family (biology), family Ramphastidae. It is the largest species of toucan and has a distinctive appearance, with a black body, a white throat, chest and uppertail-Covert ( ...
, at 63 centimetres long, and weighing 680 grams. All nest in cavities and have
altricial
Precocial species in birds and mammals are those in which the young are relatively mature and mobile from the moment of birth or hatching. They are normally nidifugous, meaning that they leave the nest shortly after birth or hatching. Altricial ...
young.
Taxonomy
The Galbulidae and Bucconidae are often separated into a distinct Galbuliformes order. Analysis of
nuclear gene
A nuclear gene is a gene whose DNA sequence is located within the cell nucleus of a eukaryotic organism. These genes are distinguished from extranuclear genes, such as those found in the genomes of mitochondria and chloroplasts, which reside ou ...
s confirms that they form a lineage of their own, but suggests that they are better treated as a
suborder
Order () is one of the eight major hierarchical taxonomic ranks in Linnaean taxonomy. It is classified between family and class. In biological classification, the order is a taxonomic rank used in the classification of organisms and recognized ...
. The other families form another
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 of suborder rank, but the barbets were determined to be
paraphyletic
Paraphyly is a taxonomic term describing a grouping that consists of the grouping's last common ancestor and some but not all of its descendant lineages. The grouping is said to be paraphyletic ''with respect to'' the excluded subgroups. In co ...
with regard to the toucans and hence, the formerly all-encompassing Capitonidae have been split up. The woodpeckers and honeyguides are each other's closest relatives. According to some researchers, the entire order Piciformes should be included as a subgroup in
Coraciiformes
The Coraciiformes are a group of usually colourful birds including the kingfishers, the bee-eaters, the rollers, the motmots, and the todies. They generally have syndactyly, with three forward-pointing toes (and toes 3 & 4 fused at their b ...
.
The phylogenetic relationship between the nine families that make up the order Piciformes is shown in the cladogram below. The number of species in each family is taken from the list maintained by Frank Gill, Pamela C. Rasmussen and David Donsker on behalf of the
International Ornithological Committee
The International Ornithologists' Union (IOU) is an international organization for the promotion of ornithology. It links basic and applied research and nurtures education and outreach activities. Specifically, the IOU organizes and funds global co ...
(IOC).
Evolution
Reconstruction of the evolutionary history of the Piciformes has been hampered by poor understanding of the evolution of the zygodactyl foot. A number of prehistoric families and genera, from the Early
Eocene
The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...
subgenus
In biology, a subgenus ( subgenera) is a taxonomic rank directly below genus.
In the International Code of Zoological Nomenclature, a subgeneric name can be used independently or included in a species name, in parentheses, placed between the ge ...
leaf beetle
The beetle family Chrysomelidae, commonly known as leaf beetles, includes over 37,000 (and probably at least 50,000) species in more than 2,500 genera, making it one of the largest and most commonly encountered of all beetle families. Numerous s ...
s described in 1835. to the
Miocene
The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and mea ...
''"Picus" gaudryi'' and the
Pliocene
The Pliocene ( ; also Pleiocene) is the epoch (geology), epoch in the geologic time scale that extends from 5.33 to 2.58Bathoceleus'' are sometimes tentatively assigned to this order. There are some
extinct
Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...
ancestral Piciformes known from
fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserve ...
s which have been difficult to place but at least in part probably belong to the Pici. The modern families are known to exist since the mid-late
Oligocene
The Oligocene ( ) is a geologic epoch (geology), epoch of the Paleogene Geologic time scale, Period that extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that defin ...
to early Miocene; consequently, the older forms appear to be more basal. A large part of Piciform evolution seems to have occurred in
Europe
Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...
where only Picidae occur today; perhaps even some now exclusively
Neotropical
The Neotropical realm is one of the eight biogeographic realms constituting Earth's land surface. Physically, it includes the tropical terrestrial ecoregions of the Americas and the entire South American temperate zone.
Definition
In biogeogra ...
families have their origin in the
Old World
The "Old World" () is a term for Afro-Eurasia coined by Europeans after 1493, when they became aware of the existence of the Americas. It is used to contrast the continents of Africa, Europe, and Asia in the Eastern Hemisphere, previously ...
.
Classification
Order: PICIFORMES
* Unassigned (all
fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserve ...
)
** Piciformes gen. et sp. indet. IRScNB Av 65 (Early Oligocene of Boutersem, Belgium)
** Piciformes gen. et sp. indet. SMF Av 429 (Late Oligocene of Herrlingen, Germany)
* Suborder Galbuli
** Family
Galbulidae
The jacamars are a family, Galbulidae, of birds from tropical South and Central America, extending up to Mexico. The family contains five genera and 18 species. The family is closely related to the puffbirds, another Neotropical
The Neotro ...
– jacamars (18 species)
** Family Bucconidae – puffbirds, nunbirds and nunlets (some 38 species)
* Suborder
Pici
''Pici'' (, ) is thick, hand-rolled pasta, like fat spaghetti.''Il Devoto-Oli. Vocabolario della lingua Italiana'', edited by Luca Serianni and Maurizio Trifone, Le Monnier. It originates in the province of Siena, in Tuscany; in the Montalcino ...
fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserve ...
)
*** Genus '' Rupelramphastoides'' (Early Oligocene of Frauenweiler, Germany)
*** Pici gen. et sp. indet. (Middle Miocene of Grive-Saint-Alban, France)
*** Family Miopiconidae (
fossil
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserve ...
)
*** Family Picavidae (fossil)
** Infraorder Ramphastides
*** Family Megalaimidae – Asian barbets (about 35 species)
*** Family Lybiidae – African barbets (about 43 species)
*** Family Capitonidae – New World barbets (about 15 species)
*** Family Semnornithidae – toucan barbets (2 species)
*** Family Ramphastidae – toucans (about 43 species)
** Infraorder Picides
*** Family Indicatoridae – honeyguides (16 species)
*** Family Picidae – woodpeckers, piculets and wrynecks (around 240 species)