Zenaida auriculata

Geographic Range

Eared doves ( Zenaida auriculata ) are native to the Caribbean and South America, ranging from Trinidad and other Caribbean Islands to southern Argentina. They are common to the Chaco region of Argentina and Paraguay, where they form semi-permanent breeding colonies, and to the semi-arid corridor between the coastal and Amazonian rainforests where they migrate to temporary breeding colonies in northeastern Brazil.

• Biogeographic Regions
• neotropical neotropical
  • native native

Habitat

Eared doves live in arid to semi-arid scrubland ranging up to 4,400 m above sea level. They inhabit open grassland with some trees or woodland patches, although tropical forests are avoided. They breed in dense patches of vegetation, nesting under thorny bromeliads and under tree and shrub canopies. They are also very commonly found in urban and suburban parks, gardens, industrial areas and among agricultural areas where they are a major pest species. Adapting well to human activity, their range has expanded as a result of agricultural development of rainforest as well as urban expansion.

• Habitat Regions
• temperate temperate
• tropical tropical
• terrestrial terrestrial

• Terrestrial Biomes
• savanna or grassland savanna or grassland
• scrub forest scrub forest

• Other Habitat Features
• urban urban
• suburban suburban
• agricultural agricultural

Physical Description

Eared doves are a small dove species, similar to mourning doves ( Zenaida macroura ) in color and pattern. They range in length from 22 to 28 cm with a wingspan from 13.5 to 16.3 cm. They weigh between 120 to 180 g. Compared to mourning doves , eared doves have shorter, less graduated tails, heavier black bills, and plumage of yellow bronze metallic iridescence on the nape and sides of neck. They are generally gray or olive-brown with a pink to vinaceous breast and underbody. They have a bare orbital space beneath the eye and a rosy forehead and throat. They have black spots beneath the ear coverts and behind the eyes and on the outer scapulars. Their feet and tarsi are red or red-violet. Females are generally a duller brown with a reduced irridescent display on their neck. They also have less intense pink on their breasts and head. Juveniles are duller still than adult females, with narrow wedge-shaped streaks on the breasts and sides of the neck. They also have dull white streaks on the terminal ends of their wing coverts and scapulars.

• Other Physical Features
• endothermic endothermic
• homoiothermic
• bilateral symmetry bilateral symmetry

• Sexual Dimorphism
• male more colorful

Reproduction

Eared doves form breeding pairs and raise their young together. In some areas they form large breeding colonies. Male eared doves have two courtship displays: the chase display and the nest-site display. The chase display entails the male running after the female while vigorously flapping his wings and periodically stopping to coo while inflating his neck. In the nest-site display, the male will crouch over the potential nest-site while raising his tail feathers, fanning them to display his tail pattern while inflating his neck and cooing.

• Mating System
• monogamous monogamous

Eared doves may breed colonially or in pairs, depending on the region. Throughout most of their range, eared doves nest in pairs. They usually nest above ground, but regionally they nest on the ground as well. Small nest platforms are built of twigs and lined with grasses in dense low shrubs or trees, usually 1 to 18 m above the ground. With a clutch size of usually 2 eggs, 52% of nests successfully rear at least one chick. Incubation lasts about 14 days and squabs fledge after 12 to 15 days. Hatchlings feed exclusively on crop milk and, as they mature, they are fed increasing amounts of seeds. As is common among Zenaida species, young birds quickly become independent, allowing the adults to breed again.

Eared dove breeding season is variable according to local food availability. They nest from March to August in Colombia, from April to November in Venezuela, from December to January and again from March to September in Trinidad. In Argentina they nest from April to August and in Brazil they nest throughout the year with a peak from April to June. Typically, breeding often followed the rainy season. But, in cultivated regions, such as in Argentina, nesting continues through most of the year.

Breeding colonies are exclusively found in northeastern Brazil’s caatinga region and in cultivated regions of Argentina. Colonial breeding is only endemic to the caatinga region. Colonies average about 5 km long by 1 km wide, containing up to 5 million individuals. In the caatinga region, nests are always on the ground, under thorny scrub and beneath tree or shrub canopy. Internally, the colonies are synchronized, building nests rapidly and laying eggs between the first and second week on the site. The birds breed only once and leave the colony quickly. Entire colonies disperse within 60 days of forming, leaving behind juveniles and a few adults.

Colonial breeding is novel to Argentina, made possible by extensive cultivation of leguminous crops. Although Argentinian colonies are located in a similar habitat with similar predators, nests are almost exclusively made off the ground. It is thought that ground nesting is associated with the scarcity of food in Caatinga, requiring faster nest building and colonial dispersal.

• Key Reproductive Features
• iteroparous iteroparous
• seasonal breeding seasonal breeding
• gonochoric/gonochoristic/dioecious (sexes separate)
• sexual sexual
• oviparous oviparous

Eared dove mated pairs cooperate to create nests, incubate, and protect their young to fledging, including creating crop milk to nourish their young after hatching.

• Parental Investment
• precocial precocial
• male parental care male parental care
• female parental care female parental care
• pre-fertilization
  • provisioning
  • protecting
    • female
• pre-hatching/birth
  • provisioning
    • female
  • protecting
    • male
    • female
• pre-weaning/fledging
  • provisioning
    • male
    • female
  • protecting
    • male
    • female

Lifespan/Longevity

Information on eared dove lifespan is not reported in the literature. However, other Zenaida species typically live an average of less than two years because of high mortality in young, but may live up to nearly 20 years old.

Behavior

Eared doves are terrestrial, conspicuous, and not shy. They are very adaptable to the presence of humans. They are commonly found in cities, suburbs, and agricultural regions, feeding in parks and gardens. They have been compared to rock pigeons ( Columba livia ) in North America. Roosting communally, they often reproduce in urban environments. Although they are usually found in pairs or small groups, they sometimes occur in large flocks.

Eared doves make sporadic and seasonal movements throughout their range. They make significant migrations across the South American lowlands. In Patagonia they migrate north or concentrate in urban areas during the winter months. Enormous numbers of doves migrate to the breeding colonies in northeastern Brazil following the wet season. Although eared doves may form the “strongest migration yet known among native birds in South America” little is published on the subject.

• Key Behaviors
• arboreal arboreal
• terricolous
• flies
• diurnal diurnal
• motile motile
• migratory migratory
• solitary solitary
• social social
• colonial colonial

Home Range

Home range sizes of eared doves are not reported in the literature.

Communication and Perception

Eared doves produce a deep, growling, melancholic coo that begins with a loud pure note and becomes progressively deeper, with more growling. During courtship, eared doves exhibit a bowing display that is similar to other dove species. Their display consists of standing and cooing while inflating the neck and fanning their tail, revealing the tail pattern. The males may exhibit a flying display in which they fly to a high point and glide down in a circular pattern while inflating their neck.

• Communication Channels
• visual visual
• acoustic acoustic

• Perception Channels
• visual visual
• tactile tactile
• acoustic acoustic
• chemical chemical

Food Habits

Eared doves exploit many available foods, but primarily feed on seeds picked up off the ground. They take advantage of cultivated grain crops and are often considered a pest species in agricultural areas. When in season, agricultural plants such as wheat, rice, sorghum, maize and soybeans may comprise the entirety of the diet. From December to March, when crops are being sown and are hence unavailable, eared doves rely on their native diet. In non-agricultural areas, eared doves rely on native seeds and grains. Small seeds of annual plants that can be collected from the ground compose the majority of their diet. Echinochloa colonum , a common savannah grass, and Croton jacobinensis are important seed food for these doves. Their diet may also be augmented by animal foods, such as caterpillars, insect pupae, aphids, and snails.

• Primary Diet
• herbivore herbivore
  • granivore granivore

• Animal Foods
• insects

• Plant Foods
• seeds, grains, and nuts

Predation

Because eared doves are a terrestrial species that often nest on or close to the ground, they are subject to a variety of predators. Adults are preyed upon by terrestrial predators, such as oncillas ( Leopardus tigrinus ), lesser grisons ( Galictis cuja ), tayras ( Eira Barbara ), big-eared opossums ( Didelphis aurita ), rufous-crested cacholotes ( Pseidoseisura cristata ), and various species of lizard and snake. Common egg and nestling predators are red-backed hawks ( Buteo polyosoma ), Chimango caracaras ( Milvago chimango ), opossums and possibly Guira cuckoos ( Guira guira ). Opossums are known to forage in breeding colonies for eggs, but heavy predation is countered by the massive numbers and synchronized breeding patterns in colonies.

Ecosystem Roles

Eared doves are common or abundant in parts of their range and play important roles in seed predation, seed dispersal, and serve as important prey species for terrestrial and avian predators.

Economic Importance for Humans: Positive

In Argentina and Brazil, adult birds are hunted and their eggs are collected for food.

• Positive Impacts
• food food

Economic Importance for Humans: Negative

Eared doves are viewed as a pest species in many parts of South America. Today, the bulk of their diet is composed of agricultural seeds and grains such as wheat and millet. In Colombia, eared doves are reported to cause significant economic damage to soy bean crops. Brazil reports similar problems with wheat and rice crops. Despite heated debates over control measures, many parts of South America spend significant sums of money on eradication projects each year. In addition to agricultural damage, eared doves are carrier species for St. Louis Encephalitis Virus (SLEV). Horses, cattle, and domestic birds have also been found to be naturally infected with SLEV in South America, SLEV is transmitted by mosquito and is potentially fatal to humans. An outbreak in 2005 resulted in 47 confirmed cases of human infection with 9 fatalities.

• Negative Impacts
• injures humans
  • carries human disease
• crop pest
• causes or carries domestic animal disease causes or carries domestic animal disease

Conservation Status

Eared doves are not threatened and are common throughout their South American range. They are extensively hunted in in breeding colonies in Argentina and Brazil, for food and crop protection. Following their arrival to the colonies, many people congregate to collect eggs and hunt the birds. Although the birds still congregate and form huge migratory flocks, there is evidence that colonies in north-eastern Brazil are dwindling. Reserves in Brazil have been proposed to preserve the massive migrations and colonies of eared doves.

Additional Links

Encyclopedia of Life

Contributors

Daniel Houvener (author), Northern Michigan University, Alec Lindsay (editor), Northern Michigan University, Tanya Dewey (editor), University of Michigan-Ann Arbor.

References

Almeida, F. 2008. Eared dove (Zenaida auriculata, Columbidae) as host for St. Louis encephalitis virus (Flaviviridae, Flavivirus). Vector-Borne and Zoonotic Diseases , 8/4: 277.

Bucher, E. 1982. Colonial Breeding of the Eared Dove (Zenaida auriculata) in Northeastern Brazil. Biotropica , 14/4: 255-261.

Gibbs, D., E. Barnes. 2001. Pigeons and doves: a guide to the pigeons and doves of the world . London: Gardners Books.

Goodwin, D., R. Gillmor. 1983. Pigeons and doves of the world . Ithaca, New York: British Museum (Natural History).

Goodwin, D. 1966. The Bowing Display of Pigeons in Reference to Phylogeny.. The Auk , 83/1: 117-123.

Murton, R., E. Bucher. 1974. The Ecology of the Eared Dove (Zenaida auriculata) in Argentina.. The Condor , 76/1: 80-88.

Naumburg, E., E. Kaempfer. 1933. A study of Zenaida auriculata. American Museum novitates , 1: 1.

Ranvaud, R., K. Freitas. 2001. Diet of Eared Doves (Zenaida auriculata, Aves, Columbidae) in a sugar-cane colony in South-eastern Brazil.. Brazilian Journal of Biology , 61/4: 651-660.

Rozzi, R. 2010. Multi-Ethnic Bird Guide of the Subantarctic Forests of South America . Denton, Texas: University of North Texas Press.

Sick, H. 1968. Vogelwanderungen im kontinentalen Südamerika.. Vogelwarte , 24: 217-243.

Villegas, M., A. Garitano-zavala. 2010. Bird community responses to different urban conditions in La Paz, Bolivia.. Urban Ecosystems , 13/3: 375-391.