Wildlife of
Northern Territory

Dominant Top End biome of eucalypt open forests and grassy understoreys (notably speargrass), strongly influenced by monsoonal wet/dry seasons and frequent fire; includes savanna woodlands across Arnhem Land, Kakadu surrounds, Daly/Victoria basins and Gulf country.

Widespread across the northern portion (Top End and Gulf regions); one of the major biomes, but most of the territory by area is arid and semi-arid.

Monsoon forests/woodlands and vine thickets occurring as patches within the savanna matrix (e.g., fire-sheltered sites, coastal fringes, and along rivers), plus denser eucalypt woodlands on more fertile or moister substrates.

Patchy and localized in the Top End, especially in fire-protected pockets, riparian corridors, and some coastal/near-coastal areas.

Small, species-rich monsoon rainforest pockets (often called 'monsoon vine forests') in sheltered gullies, sandstone escarpments, islands (e.g., Tiwi), and perennial riparian zones; not extensive but ecologically important refugia.

Very limited and fragmented, mostly in the far north and in protected microclimates (escarpments, gorges, islands).

Arid interior deserts and semi-deserts with dune fields, stony plains, spinifex grasslands, mulga and other acacia shrublands/woodlands; productivity is episodic following rainfall pulses.

Extensive across the central and southern NT (Tanami and Simpson deserts and adjacent arid zones).

Tropical rivers with big wet season flows and dry season refuges like waterholes and springs, including Daly, Victoria, Roper, McArthur and Katherine catchments, plus inland lakes (Lake Woods) and desert waterholes.

Occurs as linear networks and scattered waterbodies territory-wide; densest in the Top End river catchments.

Monsoonal floodplains, billabongs, paperbark swamps, and seasonally inundated grass/sedge plains (iconic in Kakadu and along the Mary/Adelaide/Alligator rivers), plus coastal saline wetlands and tidal flats; highly dynamic with wet-dry cycles.

Concentrated in the Top End lowlands and major floodplains; smaller but important occurrences around inland drainage lines and claypans.

Nearshore tropical seas and coastal waters of the Timor and Arafura seas and the Gulf of Carpentaria, supporting seagrass meadows, soft-sediment seabeds, reefs/shoals, and productive estuaries; strong tidal regimes and riverine inputs shape coastal ecology.

Along the entire northern coastline (Darwin/Van Diemen Gulf, Arnhem coast, and Gulf of Carpentaria shores).

Eucalypt savanna landscapes with seasonal grasses and frequent fire regimes across the Top End (e.g., Kakadu surrounds, Arnhem Land, Daly Basin).

Open eucalypt and acacia woodlands, including tropical eucalypt woodlands in the north and mulga-dominated woodlands in arid interior areas.

Northern floodplain grass/sedge communities in the wet season and inland pastoral grasslands (e.g., Barkly Tableland/'Mitchell grass' areas) where soils are suitable.

Arid and semi-arid shrublands (often acacia and other drought-adapted shrubs) across central NT, frequently intergrading with spinifex communities.

Dune fields, stony deserts, and sandplains (notably Tanami and Simpson) with spinifex and sparse shrubs; water availability is highly episodic.

Denser tropical eucalypt forests/woodlands and monsoon forest patches on moister or more fertile sites, including parts of the Tiwi Islands and sheltered mainland pockets.

Small monsoon rainforest (vine forest) refuges in fire-protected gullies, gorges, and coastal/island sites; high local plant diversity despite tiny extent.

Large tropical rivers (Daly, Victoria, Roper, Katherine, McArthur) with riparian corridors, deep dry-season pools, and important fish and waterbird habitats.

Seasonal and semi-permanent inland lakes and basins such as Lake Woods and other claypan systems that boom after rains and contract to refuges in the dry.

Extensive floodplains, billabongs, paperbark wetlands, and seasonally inundated plains-globally significant in areas like Kakadu.

Paperbark (Melaleuca) swamps and freshwater swamp forests in low-lying Top End areas that retain water longer into the dry season.

Sedge- and grass-dominated marshes on floodplains and around billabongs, with strong seasonal expansion/contraction.

Mangrove forests fringing estuaries and sheltered coasts (e.g., around Darwin Harbour/Van Diemen Gulf and Gulf of Carpentaria inlets), key nursery habitat for fish and crustaceans.

Highly tidal estuaries and river mouths supporting mangroves, mudflats, and seagrass; ecologically important transition zones along the northern coast.

Northern coastline with tidal flats, coastal floodplains, headlands, and offshore islands (including Tiwi and parts of Arnhem Land coast).

Sandy shorelines along the Timor/Arafura/Gulf coasts, important for coastal processes and fauna (including nesting in some areas).

Rocky headlands, sandstone and lateritic coastal outcrops, and island shorelines, especially around parts of Arnhem Land and offshore islands.

Localized reef and reef-associated communities on offshore banks/shoals and some island areas in NT waters (less continuous than the Great Barrier Reef but still significant).

Predominantly soft-sediment tropical shelf habitats in the Arafura/Timor seas and Gulf of Carpentaria, influenced by tides and river sediment inputs.

Offshore waters beyond the immediate coast used by migratory megafauna and pelagic fisheries, especially north of Arnhem Land and across the Timor/Arafura seas.

Karst and limestone cave systems (notably in parts of the Katherine region) providing roosts and specialized subterranean habitats.

Sandstone escarpments and gorge walls (e.g., Arnhem Land Plateau/Kakadu escarpments and central ranges) with cliff-line refugia and endemic-rich niches.

Rugged uplands and ranges (e.g., MacDonnell Ranges, Arnhem Land Plateau) creating cooler, wetter microhabitats and complex topography.

Urban ecosystems around Darwin/Palmerston and Alice Springs, including modified coastlines, urban wetlands, and heat/drought-adapted urban biota.

Pastoral rangelands dominate much of the NT; smaller areas of irrigated and horticultural agriculture occur mainly in the Top End and along riverine/alluvial soils.