Understanding Whale Behaviour on Your Sydney Whale Watching Cruise

27 May 2025

Whale watching off the coast of Sydney is a mesmerising experience. Seeing these gentle giants in their natural habitat is something truly unforgettable – and understanding a little about their behaviour can make your whale watching adventure even more enriching.

The Humpback Highway: an annual migration

From May through to November, the east coast of Australia becomes a marine superhighway for humpback whales. This route, often dubbed the Humpback Highway, sees tens of thousands of whales travelling from the icy feeding grounds of Antarctica to the warmer waters of Queensland to breed and give birth. Sydney sits in a prime position along this migratory corridor, offering front-row seats to one of nature’s most spectacular journeys.

What whale behaviours might you see?

Each sighting at sea is unique, but there are several fascinating behaviours you might be lucky enough to observe. These actions give us a glimpse into the complex lives of humpbacks and other marine mammals.

Breaching

One of the most dramatic and well-known behaviours, breaching is when a whale launches itself out of the water before crashing back with an almighty splash. While the precise reason remains a mystery, scientists believe breaching could be a form of communication, a method of dislodging parasites, or simply play.

Tail slapping

This behaviour involves a whale lifting its massive tail flukes high above the surface before slapping them down hard on the water. It’s thought to be a signal to other whales – possibly a warning or a territorial display.

Pectoral fin slapping

You might spot a humpback floating on its back, lifting one or both pectoral fins, and smacking them against the water. These lengthy fins – often up to five metres long – are used in what could be playful interaction or social signalling.

Spyhopping

In this behaviour, the whale pokes its head vertically out of the water, appearing to "spy" on its surroundings. It’s a curious action, often thought to help whales see what’s happening above the surface – maybe even to take a peek at your boat.

Blowing and surfacing

This is one of the most frequent sights on a cruise: a whale breaking the surface to breathe, expelling air and water vapour through its blowhole. The shape and height of the blow can help identify different species, and careful observation might reveal patterns that hint at the whale’s mood or activity.

Other marine life behaviours

It’s not just humpbacks who make an appearance. You may also encounter:

• Dolphins: These acrobatic animals often leap alongside boats, surf the bow waves, and showcase their playful nature.
• Seals: Usually spotted lazing on rocky outcrops, seals can occasionally be seen diving and twisting through the surf.
• Orcas (killer whales): Rare but unforgettable, orcas are apex predators known for their sophisticated hunting techniques and social structures.

Tips for the best whale watching experience

• Be patient: Nature follows its own schedule. Sometimes, it takes a while before the whales show themselves – but the wait is always worth it.
• Stay respectful: Responsible operators maintain a safe distance from whales to ensure their wellbeing. Always follow crew instructions and never try to feed or touch marine wildlife.
• Bring binoculars and a camera: You’ll want to remember the moment. A good camera and a steady hand can capture some of the magic, and binoculars help you spot detail from afar.

Supporting marine conservation

Whale watching isn’t just an awe-inspiring adventure – it also plays a part in conservation. Operators like Go Whale Watching Sydney follow best practices for ethical wildlife tourism, contribute to ongoing research, and help raise awareness about the importance of protecting our oceans and marine life.

Understanding whale behaviour enriches the experience of a Sydney whale watching cruise. Every breach, blow and fluke you witness is part of a bigger story. Understanding these behaviours deepens our connection to the natural world and inspires us to protect it.

Ready to experience it for yourself? Book your Sydney whale watching cruise with Go Whale Watching Sydney and witness the wonder of the humpback migration first-hand.