When I stand on Australia’s southern coastline and watch the ocean, I am never entirely sure what will appear. Some days it is only waves and wind. Other days, a southern right whale surfaces, and the whole seascape feels different. These whales carry centuries of memory in their bodies, travelling thousands of kilometres between feeding and calving grounds, following routes that shaped marine corridors long before we named them.

Whales that can outlive us by generations

Southern right whales belong to a family of whales now known to be far longer lived than once thought. Some individuals can exceed 130 years, which means a single whale may witness changes in ocean climate, noise, ship traffic and coastal development across multiple human lifetimes. When we talk about protecting their migratory corridors, we are talking about safeguarding the lifetime journeys of animals that may still be here long after we are gone.

Capital breeders on a long commute

Southern right whales are capital breeders. They feed intensively in cold, rich waters during summer, building thick blubber reserves. Then they migrate thousands of kilometres to warmer, calmer coastal areas to give birth and raise their calves, relying almost entirely on stored energy while they are there. In Australian waters, that journey can be more than 6,000 kilometres, a long arc connecting feeding grounds, resting areas and calving bays.

Upside down at the surface

One of the most intriguing behaviours researchers have documented is the way mothers rest upside down at or just below the surface. At first glance it looks wrong, as if the whale might be injured. Careful observation has shown something very different. By turning upside down, the mother keeps her sensitive belly and mammary glands away from her calf for a short time. She can still breathe easily, but the calf finds it harder to nurse. This gives her a chance to conserve energy during one of the most demanding periods of her life.

It is a quiet act of self protection that also protects the calf in the long run. A mother who manages her energy well is more likely to survive the season and make it back to the feeding grounds. Watching her roll upside down feels like witnessing a living lesson in boundaries. She is deeply invested in her calf, yet she cannot give endlessly.

What the males do during migration

While mothers make the long journey to sheltered calving bays, the males follow a very different pattern. They do not travel to nursery grounds and they play no role in raising calves. Most males remain in or near the feeding grounds throughout winter, continuing to build and maintain their energy reserves in the cold, productive waters of the Southern Ocean. They move widely, sometimes travelling thousands of kilometres along the Australian coast in a single season.

Their movements are broader and less predictable than those of the females. Males wait for the breeding season to begin, when females return to deeper offshore waters after months spent caring for their young. Courtship and mating take place far from the quiet bays where calves are born. This separation keeps calving grounds peaceful and safe for mothers and newborns, while males conserve energy and position themselves for the next reproductive cycle.

How females shape the rhythm of the species

Female southern right whales have their first calf at around six or seven years of age, and from then on they usually have one calf every three years. They are slow breeders, which is why populations take so long to recover from past impacts. After giving birth, mothers remain in the same coastal bay for several months, relying entirely on stored energy while nursing their calf. The calf grows rapidly, preparing for the long migration south to the feeding grounds.

Most females return to the same embayment where they were born to raise each calf, although some swap calving areas. These swaps can occur between Australian locations, and occasionally even between Australia and New Zealand. By the time the return migration begins, calves are fully weaned. It is rare to see a mother accompanied by a year old offspring on winter breeding grounds, because the young whales have already begun their independent lives.

Migration patterns across deep southern waters

Southern right whales migrate into the Southern Ocean during summer, sometimes travelling as far as 60 degrees south, even into pack ice. Their feeding grounds are cold, productive places where copepods and krill are abundant. Whales without calves can travel extraordinary distances along the Australian coast in a single winter, moving between Tasmania, Victoria, South Australia and Western Australia.

Recognising individuals across decades

Each southern right whale carries a unique pattern of callosities on its head. These rough patches of skin act like fingerprints, allowing researchers to identify individuals across years and locations. This makes long term tracking possible, revealing where whales travel, how often they return to certain bays and how their movements shift across decades. For a species that may live more than a century, these patterns become a record of memory and movement.

Corridors of memory

If a southern right whale can live for more than a century, then the routes she travels become corridors of memory. She may return to the same feeding grounds and calving bays year after year, carrying the imprint of each journey in her body. Changes in sea ice, prey availability, noise, ship strikes or entanglement risk are not abstract trends for her. They are lived experiences, repeated across decades.

What southern right whales teach me

Southern right whales remind me that longevity and vulnerability can exist together. They are capable of living for more than 130 years, yet a single ship strike, a season of poor feeding or a disrupted calving ground can cut that life short. Their upside down resting posture looks strange until we understand the energy maths behind it. Their migrations seem vast until we realise they are repeating them over and over, building a lifetime of journeys along the same corridors.

For Connecting Corridors, they are a powerful symbol. They show how movement, care and place are intertwined, and how protecting one stretch of coastline or one patch of ocean is never enough on its own. To honour a whale that might live longer than any of us, we have to think in long arcs, across generations, and keep the pathways between feeding, resting and calving grounds open. In doing so, we give these quiet, resting mothers and their calves a better chance to complete the journeys they began long before we started watching.