Little bustard (Tetrax tetrax)

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Male little bustard in grass meadow
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Little bustard fact file

Little bustard description

KingdomAnimalia
PhylumChordata
ClassAves
OrderGruiformes
FamilyOtididae
GenusTetrax (1)

The pheasant-sized little bustard (Tetrax tetrax), the only member of the Tetrax genus, is the smallest of the Palaearctic bustards. The breeding male is brown on the upperparts of the body and white below, while the head is grey. The neck has a striking pattern of black bordered by white markings, a feature missing in the more drab-looking plumage of the female and non-breeding males. The underside of the female is much darker than in the male, and immature little bustards look very similar to females. When in flight, the wings of this species are extensively white (3).

As ground-dwelling birds, most species of bustard have relatively short toes and strong legs to allow them to run across arid land (6). Both the male and female little bustard are usually silent; however, the male does have a distinctive ‘prrt’ call which sounds like it is blowing a raspberry (3).

Spanish
Sisón.
Size
Length: 42 - 45 cm (2) (3)
Wingspan: 90 - 110 cm (2) (3)
Weight
830 g (2)
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Little bustard biology

As an omnivore, the little bustard feeds on invertebrates (2), particularly insects (3) (5), as well as seeds (3). Abundant amounts of insects are required during the chick rearing period (5).

The little bustard has a mating system known as lekking (5), in which the males collectively perform a rather flamboyant courtship display involving foot stamping and leaping through the air (3).

The timing of the breeding season varies depending on the location, but in Spain breeding tends to occur between February and June, while in France it is a little later, generally between May and August (5). The female usually lays three to five eggs per clutch (3), but clutch sizes are known to vary between one and six eggs (5). The nest of the little bustard is a shallow, well-concealed depression in the ground with grassy cover, which is usually found near the territory of the breeding male. The female little bustard is the sole provider of parental care for the chicks, and will incubate the eggs for three weeks. Little bustard chicks are precocial and despite not fledging until 45 to 50 days of age are able to fly at about 20 days old. Some young remain with the female in post-fledging flocks (5). This species is gregarious, gathering together in flocks, particularly in winter (3).

The little bustard has a rather dignified, slow walk, and if frightened or disturbed it will tend to run rather than fly (3).

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Little bustard range

The little bustard is split into two widely spread breeding populations (7), which together cover parts of southern Europe, northwest Africa and central Asia (2). In its eastern range, this species occurs in Russia, Georgia, Ukraine, Kazakhstan, Kyrgyzstan, northwest China, northern Iran and Turkey. The western range holds 60 percent of the little bustard’s total population, with the majority being found in Spain and Portugal. Smaller populations within the western range are also found in Italy, France and possibly Morocco (5) (7).

The little bustard historically had a much larger breeding range (3), and has sadly already become extinct in 11 European countries, as well as in Algeria and Tunisia. Its breeding population is thought to be extinct in Azerbaijan (7), though the migratory eastern population of the little bustard still winters there, as well as in Turkey and Iran (5).

The western population of the little bustard winters in the Mediterranean, with the Iberian Peninsula holding the most important wintering quarters for this species. The little bustard is also known to irregularly winter elsewhere in southern Asia. The only remaining migratory population in Western Europe hails from central France, and these birds winter in Spain and Portugal, whereas the Sardinian population is sedentary (5).

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Little bustard habitat

Dry, temperate grassland is the preferred habitat of the little bustard (7), which tends to be found in more open areas containing diverse ground cover and some tall vegetation (more than 40 centimetres) in which it can take cover from predators (3) (5).

This species requires a wide variety of habitats for breeding and nesting. The male and female little bustard have different preferences, with the male generally preferring shorter vegetation which allows it to display effectively to females. The female typically prefers taller, denser vegetation to shelter in (5).

In the winter months, the little bustard tends to select agricultural habitats such as winter stubble, fallow land or leguminous crops which have a higher availability of food as well as shelter from potential predators (5).

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Little bustard status

The little bustard is classified as Near Threatened (NT) on the IUCN Red List (1) and is listed on Appendix II of CITES (4) (5).

IUCN Red List species status – Near Threatened

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Little bustard threats

The main threat to the little bustard is habitat loss (3) (5), primarily as a result of the conversion of its dry grassland habitat into intensive arable land for agriculture. Fragmentation of grassland can negatively affect the quality and availability of the habitat, and can lead to a decrease in male density (7).

Pesticides are thought to be a problem for this species, as their use decreases the availability of insects for food which in turn affects the fecundity and survival of the eggs and chicks. The availability of food for the little bustard is also affected by land use changes. For instance, dense vegetation growing as a result of land abandonment might impair the bird’s ability to search for food, while overgrazing can lead to reductions in the number of insects available (5).

Farm machinery has also been reported to be a threat to the little bustard, either through the destruction of nests or direct mortality of adult and juvenile birds during harvesting. In south-western France, farm machinery is accountable for 40 percent of all clutch failures (5).

Further threats to the little bustard include urban development, hunting and collisions with power lines (5) (7).

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Little bustard conservation

The little bustard is listed on Appendix II of the Convention on International Trade in Endangered Species (CITES), meaning that international trade in the species should be carefully monitored (4). It occurs in more than 750 Species Protection Areas (SPAs), and has been included in the national lists of threatened species in all range states. However, despite the large number of SPAs in which it is found, less than half of the breeding population is covered by protected areas (5).

The little bustard is offered some protection through its listing as a Species of European Conservation Concern, European Species of Global Concern, and its Vulnerable European Threat Status. Furthermore, it is classified under Annex I of the EU Birds Directive (8) as well as Appendix II of the Bern Convention, which aims to conserve the wild flora and fauna of the European Continent (9).

In 2001, a European action plan was developed for the little bustard, which aims to achieve a reversal in its current downward population trend by 2020 (5). The number of protected areas established in suitable steppe habitats within Portugal, Spain and France has increased (7).

Proposed conservation measures include improving the management of the little bustard’s habitat within SPAs (5), as well as population monitoring and eliminating dangerous power lines across its range. Further actions, such as working with land-owners to reduce hunting pressures (7), encouraging favourable land management and implementing mitigation measures, would also benefit the little bustard (5) (7).

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Find out more

For more information on the little bustard and other bird species:

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

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Glossary

Fecundity
A measure of fertility, such as sperm count or egg count or the number of live offspring produced by an organism.
Genus
A category used in taxonomy, which is below ‘family’ and above ‘species’. A genus tends to contain species that have characteristics in common. The genus forms the first part of a ‘binomial’ Latin species name; the second part is the specific name.
Incubate
To keep eggs warm so that development is possible.
Invertebrates
Animals with no backbone, such as insects, crustaceans, worms, molluscs, spiders, cnidarians (jellyfish, corals, sea anemones) and echinoderms.
Leguminous
Relating or belonging to plants in the legume family (Leguminosae or Fabaceae), which includes peas, beans, clover and alfalfa. Leguminous plants produce seeds in pods (legumes), and typically have root nodules containing symbiotic bacteria which are able to convert nitrogen from the air into nitrogen-containing compounds that benefit the plant.
Lekking
A mating system in which males display collectively in an area known as a lek, to attract and compete for females.
Omnivore
An organism that feeds on both plants and animals.
Palaearctic region
The region that includes Europe, North Africa, most of Arabia, and the part of Asia to the north of the Himalayan-Tibetan barrier.
Precocial
Young that are relatively mature, mobile and independent from the moment of birth or hatching.
Sedentary
Remaining or living in one area, not migratory.
Steppe
A vast grassland plain, characterised by few trees and low rainfall.
Territory
An area occupied and defended by an animal, a pair of animals or a group.
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References

  1. IUCN Red List (October, 2011)
    http://www.iucnredlist.org/
  2. British Trust for Ornithology - Little bustard (October, 2011)
    http://blx1.bto.org/birdfacts/results/bob4420.htm
  3. MobileReference (2008) The Illustrated Encyclopedia of European Birds: An Essential Guide to Birds of Europe. MobileReference, Boston.
  4. CITES (October, 2011)  
    http://www.cites.org/
  5. Iñigo, A. and Barov, B. (2010) Action Plan for the Little Bustard Tetrax tetrax in the European Union. SEO/BirdLife and BirdLife International for the European Commission, Madrid, Spain. Available at:
    http://ec.europa.eu/environment/nature/conservation/wildbirds/action_plans/docs/tetrax_tetrax.pdf
  6. Burnie, D. (Ed.) (2001) Animal. Dorling Kindersley, London.
  7. BirdLife International (October, 2011) 
    http://www.birdlife.org/datazone/speciesfactsheet.php?id=2759
  8. EU Birds Directive (October, 2011)
    http://www.jncc.gov.uk/page-1373
  9. Council of Europe: Bern Convention (October, 2011)
    http://conventions.coe.int/Treaty/EN/Treaties/Html/104.htm
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Image credit

Male little bustard in grass meadow  
Male little bustard in grass meadow

© Òscar Domínguez - Deepwildphoto

Òscar Domínguez
Barcelona
Spain
info@deepwildphoto.com
http://www.deepwildphoto.com/

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