SPECIES

Chilean Mockingbird Mimus thenca Scientific name definitions

Natacha González, Vicente Pantoja, Maria Jesus S. Mallea, Matías Garrido, Antoine Touret, Angélica Almónacid, Heraldo V. Norambuena, and Fernando Medrano
Version: 2.0 — Published March 3, 2023

Demography and Populations

Measures of Breeding Activity

Age at First Breeding

Information needed.

Intervals Between Breeding

Information needed.

Clutch Size and Number of Clutches per Season

The number of eggs per clutch is from two to four eggs, being three the most common clutch size (6). Usually two, and sometimes three clutches per year (6).

Annual and Lifetime Reproductive Success

Reproductive success is 30% in central Chile (6). No other information is available.

Life Span and Survivorship

Information needed.

Disease and Body Parasites

Body Parasites

Little known. A study found a prevalence of Myrsidea sp. (Amblycera: Menoponidae) in 38.1%, Brueelia rotundifrons (Ischnocera: Philopteridae) of 23.8%, Philopterus sp. (Ischnocera: Philopteridae) of 19.1%, Analges sp. (Acariforme: Analgidae) of 9.5%, Proctophyllodes sp. (Acariformes: Analgoidea) of 4.8%, Capillaria sp. (Nematoda: Trichinellidae) of 4.8% and Dispharynx nasuta (Nematoda: Acuariidae) of 4.8% (75).

Disease

In a study in Central Chile, of twenty-four birds with beak deformities recorded, five were Chilean Mockingbird, which means a high prevalence of this condition (13).

Causes of Mortality

Exposure

Information needed.

Depredation

80% of the mortality of nestlings is caused by Shiny Cowbirds that pierce eggs and lay their own, which can eventually cause the abandonment of the nest (6).

Disease

Information needed.

Direct Human Impacts

Vehicle collisions on the D-705 highway, which crosses the Las Chinchillas National Reserve in the Coquimbo region, have an important impact on passerines, and the Chilean Mockingbird is one of the most-affected species (76).

Population Spatial Metrics

Information needed.

Population Status

Numbers

The global population has not been quantified, but it is described as 'fairly common' (77).

In spring, in ten urban parks in the Eastern sector of Santiago, the average abundance of Chilean Mockingbird was 0.28 ± 0.70 birds/point/day (78). Villaseñor and Escobar (79) found a mean density of 0.43 ± 0.22 ind/ha in autumn and 0.43 ± 0.1 ind/ha in summer in urban cemeteries. On the other hand, a study that considered residential, commercial, industrial and green areas within the city, recorded an average abundance of 0.003 individuals per count (30 meters radius; 80).

Trends

According to BirdLife International, the population is suspected to be stable in the absence of evidence for any declines or substantial threats.

Population Regulation

Information needed.

Recommended Citation

González, N., V. Pantoja, M. J. S. Mallea, M. Garrido, A. Touret, A. Almónacid, H. V. Norambuena, and F. Medrano (2023). Chilean Mockingbird (Mimus thenca), version 2.0. In Birds of the World (N. D. Sly, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.chimoc1.02