Geophaps Species Overview and Habitat

The Geophaps species is a group of birds that are found in the southwestern regions of Australia.

Geophaps birds are generally found in dry, open woodlands and grasslands.

They are medium-sized birds, with the Western Brush Turkey being one of the larger species in the group.

The Western Brush Turkey is known for its distinctive red and yellow plumage.

The genus Geophaps was introduced in 1842 by English zoologist George Robert Gray to accommodate the squatter pigeon (Geophaps scripta).

The genus name combines the Ancient Greek words geō (γεω) meaning "ground" and phaps (φάψ), meaning "wild pigeon".

Geophaps pigeons are part of the family Columbidae, with a global distribution spread across three areas: the Americas, Africa and the Middle East, and Asia, Australasia, and Oceania.

Australia and Oceania are home to almost two-thirds of all living species of Columbidae, which also includes three-quarters of all threatened species globally.

The genus contains three species: the spinifex pigeon (Geophaps plumifera), the squatter pigeon (Geophaps scripta), and the partridge pigeon (Geophaps smithii).

A fourth species, the crested pigeon, is sometimes placed within the genus.

Here are the three species of Geophaps pigeons:

The spinifex pigeon has three recognized subspecies: the Eastern spinifex pigeon, the North-western spinifex pigeon, and the Pilbara spinifex pigeon.

The Geophaps species are generally described as bronzewings, with short necks and legs, and a short, slender bill. They share partridge-like flight patterns and show no differences in plumage between the sexes.

The spinifex pigeon has a distinctive facial pattern, with a bright red facial mask bordered by a black supercilium and moustachial stripe. This facial marking is a key characteristic of the species.

The Geophaps species have terrestrial habits, with the spinifex pigeon weighing 80–110 g and having a mean body length of 200–235 mm. Males are slightly larger than females, but generally difficult to visually differentiate.

Here are the physical characteristics of the three Geophaps species:

The spinifex pigeon is a small and compact pigeon, weighing 80–110 g (2.8–3.9 oz) and measuring 200–235 mm (7.9–9.3 in) in body length. Males are slightly larger than females.

The wingspan of the spinifex pigeon is approximately 300–350 mm (12–14 in). The plumage is distinctively rufous-brown with thin black bars on the wings and back.

The forehead, sides of crown, and ear coverts are grey, and the bill is black. The facial markings are bold and distinctive, featuring a bright red facial mask bordered by a black supercilium and moustachial stripe.

A white band extends from the chin to behind the eye, and the throat is black. The legs and feet are grey.

In the scorching desert environments, the spinifex pigeon has adapted to survive.

Their geographic range includes one of the hottest places on earth, Marble Bar, Western Australia, where air temperatures exceed 37.8 °C up to 160 days of the year.

To cope with this extreme heat, spinifex pigeons drink water and produce metabolic water, but their water intake from food sources is low.

They generally occur in close proximity to permanent water sources to maintain a positive water balance.

The spinifex pigeon's ability to withstand high ambient temperatures is a combination of low body heat production and increased non-evaporative heat loss through hyperthermia.

Elevated dry thermal conductance also helps to regulate their body temperature in the harsh desert environment.

They have a relatively high evaporative water loss, which is crucial for thermoregulation at high ambient temperatures.

Geophaps species are ground feeding granivores, with seeds making up their diet almost entirely. They also eat a small number of insects, specifically in the crops of Geophaps smithii.

Their diet consists mainly of seeds, with some variation depending on their habitat. For example, the Spinifex pigeon, which inhabits arid tussock/spinifex grasslands, has a diet that doesn't rely heavily on spinifex grass seeds.

Geophaps species are ground feeding granivores, with seeds making up their diet almost entirely.

Seeds are their main source of food, and studies have consistently shown this to be the case.

A small number of insects have been found in the crops of Geophaps smithii, but they are not a significant part of their diet.

The Spinifex pigeon, on the other hand, is found in arid tussock/spinifex grasslands, but the spinifex grass seeds do not make up a large portion of their diet.

In fact, the Spinifex pigeon's diet is quite different from what you might expect, given their habitat.

Spinifex pigeons are not built for long-distance flight, but rather for short, quick movements that help them escape predators in their preferred habitats like steep hills and gorges.

These birds are quite bold and will often remain still until a predator gets very close. They're not afraid to stand their ground.

In the wild, Spinifex pigeons rely on running away from predators rather than flying, using their rufous plumage to blend in with the desert sand and rocks for camouflage.

The conservation status of Geophaps species is a pressing concern. These birds are amongst the most threatened bird families around the world, largely due to habitat loss and fragmentation caused by agriculture and human interference.

Habitat loss is a major issue, as arid environments are naturally changing, making it difficult to gauge the extent of change caused by pastoralisation. Overgrazing by livestock causes alteration and degradation of soil and flora.

The installation of permanent stock watering points in areas previously without surface water has led to an increase in population size of some Geophaps species, such as the Spinifex pigeon and the Crested pigeon.

However, current threats include overgrazing by stock and feral animals, inappropriate fire regimes, and increased ambient temperatures and reduction in water availability due to climate change.

The species is listed on the IUCN Red List as a species of least concern, but its habitats are protected in several national parks throughout its range.

Here is a list of some of the national parks where Geophaps habitats are protected:

The spinifex pigeon is found throughout much of arid and semi-arid northern and central Australia.

It lives in stony habitats on rocky hills and mountainous terrain, gorges, dry rocky creek beds, and nearby gibber plains.

The species occupies environments with extreme heat during the day, extreme cold at night, high seasonal rainfall fluctuations, and extended drought periods.

Hummock-forming grasses of the Triodia and Plectrachne genera, also known as "spinifex grasses", are often found in the habitats of spinifex pigeons.

These grasses can form extensive areas of grassland that are part of the understorey component of low open savannah and woodlands of Desert Oak, Eucalypts, and Mulga.

Spinifex pigeons can be found in areas with sparse grassland, not just in spinifex habitats.

Presence around urbanised areas is rare, but the species does occur in natural habitats occupied by humans.

In fact, spinifex pigeons have even been spotted foraging on food provided to domestic fowl on at least one occasion.

The Geophaps species is a group of parrots found in Australia.

Geophaps are medium-sized parrots, typically measuring between 20 and 25 centimeters in length.

They have a stout body shape and a short, broad tail.

Pigeons in the genus Geophaps are believed to have evolved from bird fossils found in Riversleigh, north-west Queensland. These fossils were described as a new genus and species of pigeon.

The fossils are the oldest Columbia fossils to have been found globally. This discovery suggests that pigeons may have evolved in the southern hemisphere.

The fossil species has been most closely linked to the Australian bronzewings, including Geophaps species. This indicates a shared ancestry between these birds.

The fossil find indicates that the ancestry of Australian bronzewings goes back to the end of the Paleogene era.

Expand your knowledge: Australian Ringneck

Temminck, CJ 1821, is a significant date in the classification of the squatter pigeon. CJ Temminck was the person who first described the species.

The squatter pigeon's scientific name, Geophaps scripta, was given by CJ Temminck in 1821. This name is still used today.

The type locality for the squatter pigeon is Shoalwater Bay, located at 22° S. latitude in Queensland. This is where the first specimen was collected.

The geographic range of the squatter pigeon varies depending on the subspecies. Here's a breakdown of the different subspecies and their ranges:

The Partridge Pigeon is found in the wild, and a notable example of this is the "Smithii" race, which was photographed in Umbrawarra Gorge NP, NT, in January 2020.

This photo shows the Partridge Pigeon from a lateral view, giving us a good look at its overall appearance.

Geophaps breed throughout the year, with highest levels during spring and summer, coinciding with peak rainfall periods and increased food supply.

This means they take advantage of the good weather to have more babies, which is a smart strategy to ensure their survival.

Copulation occurs on the ground, and the nest is scratched out in a grass-lined depression on stony ground.

This is a pretty straightforward process, and it's not uncommon for nests to be located near other breeding pairs.

Two cream-colored eggs are laid and incubated by the female for 16 to 18 days, with both parents helping out.

Interestingly, captive birds have shown that the young are independent at just four to six weeks old.

Large populations can form in areas with favorable conditions, but numbers can decline quickly in times of extreme drought.

This highlights the importance of adapting to changing environments to survive.