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Ever wondered what it might feel like to spot giant spider crabs while you’re snorkelling? Or check plants for the circular holes that indicate native bees are collecting nest materials?

Citizen science relies on people like you – more than a in Australia, actually – to collect and analyse valuable data about the world around us.

Here, we introduce five citizen science projects you can take part in. For most of them, all you need to get started is an app on your phone.

Science lives far beyond the lab, and it’s not just done by scientists.

, we spotlight the world of citizen science – its benefits, discoveries and how you can participate.

Spider Crab Watch

, Honorary Fellow – School of Life and Environmental Sciences – Deakin University

Every winter in Port Phillip Bay in Naarm/Melbourne, tens of thousands of great spider crabs gather in shallow water to moult – shedding their shells and growing new ones that grow to about 16 centimetres. But scientists know surprisingly little about them. The gatherings can be unpredictable and short-lived, making them difficult for scientists to monitor alone.

helps researchers fill these knowledge gaps. By bringing together observations from the public – including divers, snorkellers and fishers – scientists can better understand when and where gatherings occur, how long they last, and what environmental conditions might trigger them.

Citizen scientists have already logged hundreds of observations, helping researchers identify new gathering sites and better understand when aggregations occur. Participants can log when and where they see spider crabs – whether a single crab or a large group, in Port Phillip Bay or elsewhere. Photos are helpful but not essential. Empty shells washed up on beaches can also be logged.

NOBURN

, Research Fellow – Forest Research Institute – University of the Sunshine Coast

NOBURN (the National Bushfire Resilience Network) is a citizen science project aimed at improving our understanding of the role of vegetation in bushfire risk. Using , people around Australia can log their observations – including site photographs – to support research into fuel dynamics, fuel load and bushfire risk.

Guided by the app, participants assess vegetation at a site, noting factors such as shrub density and overall fuel hazard. Observations typically take 10–15 minutes and can be conducted by community members, landholders, students or land managers. To date, we have collected 154 verified site observations and more than 160 registered users.

Observations supplied by citizen scientists help researchers understand the structure, density and dryness of forest fuels. Combined with AI, this data allows for better prediction of the likelihood and severity of fires. While this data is not as detailed as a full expert assessment, they provide useful indicative information, particularly in areas where formal fuel monitoring is limited.

FrogID

, Curator – Amphibian & Reptile Conservation Biology – Australian Museum – 91ɫ��Ƭ Sydney

Australia’s frogs are in trouble. At least four species have been lost and dozens more are on the edge of extinction. Yet we lack the information needed to make informed decisions about how to conserve them. Frogs are very sensitive to environmental change. This makes them great indicators of environmental change (they’re often referred to as the “canary in the coal mine”). By monitoring them, we also gain insight into environmental health.

taps the keen eyes and ears of people across Australia to gather the data needed to help save Australia’s frogs.

Using our free app, people can record frogs wherever they hear them. The best time is after rain and in the first few hours after dark. Once submitted, Australian Museum frog experts listen to the recordings and identify species.

There are more than 100,000 registered users of FrogID who have together gathered almost 1.5 million records of frogs from across Australia. It’s safe to say this dataset has revolutionised our understanding of frogs in Australia – including finding new to science.

1 Million Turtles

, Associate Professor in Biomedical Sciences – La Trobe University

Freshwater turtle numbers have fallen 60–90% across most of the rivers and wetlands of Australia, amid engineered flows and increasingly dry conditions. As turtles disappear, they leave a large gap. Turtles are the “vacuum cleaners” of the waterways, eating decaying organisms and vegetation and improving water quality.

The project aims to increase survival rates of freshwater turtles and turtle nests, and increase Australia’s turtle population by at least one million animals.

People of all ages and record any turtles or turtle nests they see in Australia. They can also volunteer for other activities, such as nest protection, via our website.

To date, our citizen scientists have logged nearly 34,000 turtle records across the country. They have also saved more than 2,600 turtles from dangerous road crossings, and protected more than 1,940 turtle nests from invasive foxes and pigs.

Assuming each nest held an average of 15 eggs, and half of the turtles saved on roads were adult females of reproductive age, our program has given 400,000 turtles the chance of a future in just the past five years.

Data from this community conservation program has led to the conservation status of turtle species being upgraded to threatened or endangered. It has also prompted the development of state conservation programs for turtles in New South Wales, Victoria and South Australia.

Australian ‘leafcutter’ bees

, Research Fellow – School of Science – University of Southern Queensland

Native bee numbers and we have limited information about them. There are more than 2,000 species of native bee, including the Megachile bee. Some species of Megachile bee use plant leaves or even petals to build their nests, giving them the common name of leafcutter bees.

We don’t yet know which plants these bee species rely on. This citizen science project allows the public to use an app to identify which plants the bees are relying on. By noting preferred plants, we’ll have a better idea of how to create habitats for these gorgeous native bees and pollinators.

Most native bees cannot be identified by citizens, due to the specialised skills required, and most diagnostic features being microscopic. But when it comes to plants, these are much better known among the public and can be identified easily by photos.

Members of the public can download the free and when they see a plant that has distinctive discs cut out, or see a Megachile bee in action, they can of the leaf “damage”. Once completed, gardeners, land managers and farmers will be able to access an evidence-based list of which nesting plants should accompany food plants.

, Environment & Energy Editor,

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