STATUS: IUCN Least Concern; Urban Adaptation Rating ★★★★★
WHEN AND WHERE: Most commonly seen during spring and summer. Often basks on rocks, retaining walls and creek banks.
DESCRIPTION: SVL 245mm, TL 1,000mm. Australia’s largest dragon lizard. Olive- brown to brown, with a dark stripe running from its eyes to its neck. It has dark bands on its body and a reddish tint on its chest, which is more noticeable in males, especially during mating season in spring and summer. Key ID features include strong limbs, a long tail and a prominent nuchal crest.
HABITAT: Common around freshwater creeks, rivers, ponds and wetlands. Frequently found in suburban parks, botanic gardens and residential areas with water features and dense vegetation. Prefers environments with both basking sites and immediate access to water.
NOTES: Highly adapted to urban environments. A familiar sight in populated areas throughout eastern NSW. When threatened, they typically dive into water and can remain submerged for extended periods (up to 90 minutes).
Exhibits social hierarchies – dominant males defend territories and maintain harems of females.
REPRODUCTION: Oviparous, laying up to 18 eggs in sandy nests from November to December. Eggs incubate for about three months, with hatchlings emerging in late summer.
Water Dragons quickly become relaxed around humans and are often used in educational talks by educators, like this one with Snake Tales.
Sydney’s Urban Water Dragons: Evolution in Real Time
By Chris Williams
In the heart of Sydney, evolution is unfolding before our eyes. The city’s iconic Eastern Water Dragons are adapting to urban life with remarkable speed, offering a living example of how wildlife can evolve in response to human environments.
Sydney’s Water Dragons have become more than parkland residents—they’re urban pioneers. Over recent years, researchers and field observers have documented fascinating behavioural and physical changes that suggest these reptiles are not only surviving but thriving amid concrete, crowds, and chaos.
One of the most striking observations is their unique body language. Female Water Dragons use deliberate arm waves to communicate territorial boundaries—a reptilian “keep out” gesture seen frequently in places like Centennial Park and the Botanic Gardens. Their communication is part of a complex social system involving head nods, tail slaps, and postures that would rival any suburban drama.
Competition for prime territory drives much of this behaviour. Males are noticeably larger and more muscular in urban settings, an advantage when it comes to defending basking spots or attracting females. Females, in turn, are employing surprisingly sophisticated mating strategies, often choosing multiple partners to increase genetic diversity within their populations.
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One of the most common situations we see with Eastern Water Dragons involves young males that have effectively been pushed out of the area where they grew up.
Water dragons are territorial, particularly adult males. A dominant male may tolerate younger males within or around his territory while they are still immature, but that tolerance often changes once they begin approaching reproductive size. At that point, the younger male starts to represent potential competition for territory and access to females, and he may be driven away by the dominant male.
These dispersing young males then have to find somewhere new to live. In suburban Sydney, that can mean moving along creek lines, drainage corridors, parkland and vegetated backyards until they find a suitable temporary refuge. Quite often that refuge turns out to be somebody's garden.
Swimming pools are particularly attractive. They provide a reliable source of water, warm paved areas for basking, surrounding vegetation and often plenty of insects and other small prey. To the water dragon, a suburban pool area can look like perfectly reasonable habitat.
When feeling threatened, water dragons will often jump into swimming pools. They can remain submerged for a surprisingly long period of time, often for over an hour.
These are the water dragons we are most often asked to relocate. Typically, it is a young or adolescent male that has suddenly appeared beside the family swimming pool, under outdoor furniture or somewhere around the garden and then decided to stay.
In almost every case, the animal poses no threat to the household. Eastern Water Dragons are naturally wary of people and will usually retreat rapidly if approached. Some homeowners enjoy the novelty of having such an unusual wild neighbour and are perfectly happy to let it remain. Others, particularly people who are uncomfortable around reptiles or who have dogs that continually chase the animal, would understandably prefer it to be relocated.
Where relocation is requested, it is important to remember that the animal is already in the process of dispersing and searching for a new territory. Simply moving it to another location does not automatically solve that problem. Any release site needs to provide suitable habitat, access to water, shelter and food, while also taking into account the presence of established water dragons and the territorial pressures the relocated animal may face there.
A female Eastern Water Dragon from Sydney’s Northern Beaches.
These reptiles also exhibit a clear social hierarchy, maintaining order through displays and subtle dominance cues. It’s a form of reptile politics that unfolds daily in Sydney’s parks and waterways. Observing them closely, one can’t help but see an intelligence at play—an ability to navigate complex relationships, territories, and even human presence with remarkable awareness.
Physically, city dragons are beginning to diverge from their bushland counterparts. Variations in head size, nesting depth, and body proportions suggest adaptation to different conditions—harder soils, reduced cover, and the constant proximity of humans.
In Sydney’s Water Dragons are an extraordinary case study in rapid evolution. They are reshaping themselves, generation by generation, to fit a new urban ecosystem.
This water dragon had become increasingly bold and was spending more time in this Castle Cove swimming pool than the owners. He was relocated to a more suitable location.
These dragons remind us that evolution isn’t confined to distant jungles or prehistoric fossils—it’s happening now, on the footpaths, ponds, and park benches of Sydney. They are living proof that nature doesn’t retreat from the city; it reinvents itself within it.
An adult male Eastern Water Dragon from Sydney’s North Shore.
Water Dragons do have strong jaws and sharp teeth, but would only bite if handled. They will never attack humans or be the aggressor when in a backyard. They are quick to retreat when they feel threatened.
A lot of what we now know about Eastern Water Dragons living in our cities comes from Associate Professor Céline Frère and her team at the University of Queensland. Her group has spent years studying how water dragons live, interact and adapt to increasingly urban environments. Because they have followed known animals over long periods of time, they have been able to build a much clearer picture of how these lizards behave socially and how they cope with the changes we keep making to their habitat.
Their work has shown that water dragons are far more complex than most people probably realise. They form social relationships, males and females behave differently, and urban populations can adapt surprisingly quickly to the environments we create around them. Research from Frère’s group has also looked at nesting, family relationships and how different populations respond to city living. More recently, researchers have even mapped the Australian Water Dragon genome, which gives scientists another useful tool to understand how the species is changing and adapting.
One of the big areas Frère’s team is now looking at is a fungal disease called Nannizziopsis barbatae, sometimes referred to as yellow fungus disease. It can cause nasty skin lesions, poor shedding and serious illness in affected reptiles. Eastern Water Dragons have become an important species for studying how this disease spreads and how infected animals behave. This research is particularly important because water dragons are common, visible and widespread, so what we learn from them may also help us better understand disease threats facing other Australian reptiles.
We wrote the book on urban reptiles.
This photo was taken in Balmain East with one of the resident blueys that still live in the area.
About Chris Williams
Sydney’s Most Experienced Urban Reptile Specialist
Chris Williams has spent more than 35 years working with Australia’s most iconic and dangerous reptiles. As founder of Urban Snake & Reptile Removal, he provides fast, safe and highly professional snake removal across Sydney, backed by decades of field experience and scientific knowledge.
Chris is widely regarded as one of Sydney’s leading authorities on urban reptiles — the snakes, lizards, geckos and turtles that now live alongside us as the city expands. His work focuses on how development shapes wildlife populations and how people can safely coexist with the species that turn up in homes, schools, workplaces and construction sites.
A Career Built on Reptile Expertise
Chris began working with reptiles in 1990 as a WIRES reptile-handling instructor before joining Taronga Zoo’s reptile department, where he worked with cobras, rattlesnakes and Australian elapids, and contributed to conservation programs for threatened species.
He later worked at the Australian Reptile Park and Reptiles Alive!, delivering reptile-education programs across NSW. Since 2014 he has served as President of the Australian Herpetological Society, leading the state’s oldest reptile-focused organisation.
Chris is also the author or co-author of several major reptile books, including:
Urban Reptiles,
Reptiles of the Red Centre
and Reptiles of the Greater Sydney Region, along with many more. These publications have helped cement his position as Sydney’s most knowledgeable urban reptile specialist.
Why Sydney Calls Chris
When people search for snake catcher near me, snake removal Sydney or licensed snake catcher, they want experience. Chris offers:
35+ years of hands-on reptile work
Full accreditation and insurance
Fast, 60-minute Sydney-wide response
Expert species identification
Practical advice on preventing snakes around homes and businesses
Education for schools, daycares, workplaces and community groups
