Crocodile profile

Freshwater Crocodile (Crocodylus johnstoni) | Australian Safety Guide

Crocodylus johnstoni

Database risk label: MEDIUM
Location: Northern Australia
Database size: 1.5-3m

The Freshwater Crocodile is a northern Australian crocodile of inland waterways, often called a “freshie”. It is generally smaller and more retiring than the Estuarine Crocodile, yet a defensive bite can cause punctures, lacerations and infection. [2] [3] [4]

Scientific-name check: the Australian Faunal Directory, delivered through the Atlas of Living Australia, lists **Crocodylus johnstoni Krefft, 1873 as the accepted** name. The supplied database name is current and retained here. [1] The linkable WildGuardian database profile is [Freshwater Crocodile — ID 19](/wildlife/freshwater-crocodile).

Identification limits: what a freshwater crocodile can look like

A Freshwater Crocodile is generally grey to tan or olive-brown, with darker mottling or patches. Its head is narrow-snouted, and its fine, sharp teeth can show when the mouth is closed. The eyes and nostrils sit high on the head, an adaptation useful at the water surface. [2] [3]

The most useful comparison is with Australia’s Estuarine Crocodile (Crocodylus porosus). Parks Australia describes the freshwater species as having a narrow snout and a single row of four large scutes — bony plates — directly behind the head. Estuarine crocodiles have a broader snout and lack that row of scutes. [4] Queensland’s species guidance also notes relatively even, needle-like teeth in freshwater crocodiles. [3]

These are field marks, not permission to get closer. Crocodiles may be partly submerged, obscured by glare or vegetation, or only briefly visible. Queensland warns that crocodiles can remain unseen underwater for hours. [5] If there is uncertainty, treat the situation as crocodile habitat rather than trying to confirm the species from close range.

Australian range and habitat

Freshwater Crocodiles are endemic to Australia. They occur in northern Australian inland waters; the Australian Museum describes a broad range from the Kimberley in Western Australia to the northern Cape York Peninsula in Queensland. [2] In Queensland, they occur mainly in Cape York Peninsula rivers and swamps, areas bordering the Gulf of Carpentaria and the north-west. The Queensland Government also identifies east-coast populations in the upper Herbert River, Burdekin River catchment and Ross River. [3]

Despite the common name, this is not a rule that the animal occurs only in completely fresh water. Freshwater Crocodiles live in rivers, creeks, pools, billabongs, lagoons and swamps, and can also occur in tidal reaches of some rivers. [2] [3] The Australian Museum records occurrence in brackish water as well. [2] Near the coast, waterways can also be used by Estuarine Crocodiles, so the name “freshwater crocodile” should never be read as a water-safety classification. [2] [5]

Water levels change how people may encounter them. In the wet season, floodwaters can connect habitats across floodplains; as water drops, freshwater crocodiles may gather in larger, deeper water bodies and use shallower pool edges. [2] In parts of the Northern Territory dry season, they can concentrate in isolated permanent or semi-permanent billabongs. [7]

Behaviour and ecology

Freshwater Crocodiles eat small animals. Queensland Government guidance lists insects, fish, frogs, lizards, turtles, bats and birds, with small mammals at the water’s edge sometimes taken. [3] Parks Australia similarly lists fish and small animals including frogs, lizards, snakes, rats, bats, birds and insects. [4] They are active by day but forage mainly at night, according to Queensland’s species page. [3]

Foraging is not limited to one style. A freshwater crocodile can wait near an edge for prey to approach, and may also hunt actively in shallow water or across rocky bottoms where water flows. [3] The Australian Museum describes the species as generally shy and quick to flee disturbance, yet warns that a swimmer who contacts a submerged animal can be bitten and that a threatened animal can snap defensively. [2] “Usually shy” is therefore a behaviour description, not a safety guarantee.

Breeding in Queensland begins with courtship in July or August, with nesting from August to September. [3] Visitors should avoid approaching shorelines, sandbanks or wildlife at any time; disturbance can affect animals and can put people within biting distance.

Safer encounters around northern waterways

The practical response is distance, caution and compliance with local signs. Where wildlife can be viewed, choose established infrastructure or operators rather than a water edge: Parks Australia identifies commercial cruises and elevated viewing platforms in Kakadu as ways to see crocodiles safely. [4]

Use these steps around crocodile habitat:

Keep away from the water’s edge and do not enter water outside a designated safe swimming area. The NT Government says an unsigned waterway may not be safe or free from Saltwater Crocodiles. [6]
Read and follow crocodile warning and closure signs. Parks Australia specifically advises care near rivers and billabongs and attention to crocodile warning signs. [4]
Do not approach, feed, touch or interfere with a crocodile. In Queensland, offences and fines apply to disturbing, feeding or interfering with crocodiles. [3]
Keep pets out of the water. NT Government guidance says crocodiles also prey on animals, including pets. [6]

If you notice a crocodile, do not crowd it for a photo or attempt to make it leave. Move people and pets away from the water margin and use the relevant park or wildlife authority’s reporting channels where they are provided. This page does not give handling, capture or relocation advice.

If a person is bitten or injured

A Freshwater Crocodile bite can be a serious trauma and infection risk. The Australian Museum reports that close defensive bites can cause lacerations and puncture wounds, and that bites from large animals can cause serious damage and infection. [2]

If a bite has broken the skin, Healthdirect advises seeking medical advice as soon as possible. [8] For a large or deep wound, a bite to the face or head, bleeding that will not stop, or any urgent medical concern, go to an emergency department; Healthdirect says not to drive yourself and to call Triple Zero (000) for an ambulance if needed. [8]

While arranging care, Healthdirect’s general animal-bite advice is to clean around the wound with soap and water, remove visible dirt under running water if possible, dry with a clean cloth and cover with a clean dressing. If bleeding is heavy, apply pressure with a dry dressing after cleaning. [8] A clinician can assess tissue damage, infection risk and whether tetanus protection or other treatment is needed. [8] Do not delay urgent care to clean a severe wound.

Watch for increasing pain, redness, swelling, warmth, pus or discharge, fever, or swollen lymph nodes after an animal bite; these are signs Healthdirect lists for bite-wound infection and need medical assessment. [8]

Freshwater Crocodile FAQs

Is a freshwater crocodile harmless to people?

No. The species is generally shy, and Queensland says it has not been implicated in a human fatality, but it can injure a person if provoked. [2] [3] A close encounter in water is particularly unsafe because an unseen crocodile can bite defensively. [2]

Can I tell it from a Saltwater Crocodile by its snout?

A narrow snout and four large scutes behind the head point towards a Freshwater Crocodile, whereas an Estuarine Crocodile has a broader snout and no such scute row. [4] In real conditions, however, an incomplete view is common; maintain distance and do not make water-use decisions from an attempted identification. [5]

How large do freshwater crocodiles grow?

Parks Australia says freshwater crocodiles can reach up to three metres. [4] Queensland’s guidance gives a more typical upper description for that state: males rarely exceed 2.5 metres and females grow to about 1.8 metres. [3] Size does not make close contact safe.

What do freshwater crocodiles eat?

Their diet includes fish, insects and other small animals such as frogs, lizards, turtles, birds and bats; occasionally, small mammals at the water’s edge are taken. [3] They may wait at the edge for prey or hunt in shallow water. [3]

What should I do after a crocodile bite?

Treat a skin-breaking bite as needing prompt medical advice. Call 000 for uncontrolled bleeding or a large/deep wound, or if the injury involves the face or head; Healthdirect gives the same emergency escalation for animal bites generally. [8]

References

Last reviewed: 21 October 2026. This is general information, not a substitute for medical care.