Saltwater Crocodile (Crocodylus porosus) in the wild — Catch'Um species field guide

Saltwater Crocodile (Crocodylus porosus) wildlife photograph

Overview

The saltwater crocodile is the apex predator of northern Australia, a reptile that has changed little since the dinosaurs, capable of exceeding six metres and weighing over a tonne. 'Salties' tolerate full marine conditions and have been recorded swimming hundreds of kilometres at sea.

They hunt by ambush, exploding from water to seize prey at the bank with the strongest bite ever measured in a living animal. Warning signs at every Top End waterhole are there for good reason, salties are patient, intelligent, and territorial.

Scientific nameCrocodylus porosus
Length4–6 m typically; rare individuals over 6 m
Weight400–1,000+ kg
LifespanAround 50–70 years in the wild
DietAmbush predator taking fish
ConservationLeast Concern
RegionEstuaries & Coast

Habitat

Estuaries
Mangroves
Coastal rivers
Floodplains

Estuaries, rivers, billabongs, and coastal waters across northern Australia, Southeast Asia, and India hold saltwater crocodiles. They need warm water and territory, and are most dense in the Northern Territory and Kimberley.

Countries found

Saltwater Crocodile in Australia

Field notes

Field scale for the Saltwater Crocodile: length around 4-6 m typically; rare individuals over 6 m; weight 400-1,000+ kg. Typical lifespan: Around 50-70 years in the wild.

When you are scanning habitat, prioritise estuaries, mangroves, coastal rivers, and floodplains. Those settings are where a clean look and a usable photo are most likely.

Quick ID anchor: Huge crocodilian with a broad snout, heavy armour, and a lighter irregular banding on juveniles. Confirm with behaviour and habitat before you log the discovery.

Diet

Ambush predator taking fish, birds, turtles, and mammals that come to the water's edge; large adults can take livestock or people.

Juveniles eat insects, crustaceans, and small fish before graduating to larger prey.

Behaviour

Patient sit-and-wait hunters that explode from the water; adults are strongly territorial in breeding season.

Tolerates full seawater and can travel long distances along coasts and between river systems.

How to identify

Huge crocodilian with a broad snout, heavy armour, and a lighter irregular banding on juveniles.

Larger and more coastal than freshwater crocodiles; adults often exceed 4 m.

Interesting facts

01
Saltwater crocodiles are the largest living reptiles, males can exceed 6 metres.
02
They can swim hundreds of kilometres at sea and have been found far offshore.
03
Their bite force is the strongest ever recorded in a living animal.

Conservation status

LC: Least Concern

Saltwater crocodiles are Least Concern after recovering from near extinction in Australia. Protected since the 1970s, populations have rebounded strongly across the Top End.

Sources: IUCN Red List