Imagine having a large family—your mother, aunts, grandmother, brothers, and sisters—and never being apart, swimming together along the same route throughout your lives, knowing every rock and cove. That is how a unique population of orcas lives in the waters of Puget Sound near Seattle. Scientists call them “southern residents,” and they are not simply whales—they are real families, with their own history and personalities and, unfortunately, serious difficulties that began many decades ago because of decisions made by people.
Whales with Names and Family Trees
The orcas of Puget Sound are divided into three large families, known as pods J, K, and L. Each pod contains smaller family groups, and scientists give every whale a name and number, such as J35 or K21. These are not just numbers: biologists monitor each whale from birth, knowing who its mother and grandmother are and how the whales communicate with one another.
Most remarkably, southern residents have a genuine culture. They eat almost exclusively Chinook salmon, a particular species of salmon, even when other fish are swimming nearby. Scientists say this preference is passed down from generation to generation, like a family recipe for Grandma’s pie that no one wants to change. The problem is that there are far fewer Chinook salmon than there used to be.
The Road That Was Blocked
To understand why salmon have become scarcer, we need to go back almost a century. During the early and mid-20th century, engineers built dozens of dams on rivers in the American Northwest. At the time, this was a true engineering marvel: the dams provided cities with cheap electricity, protected farmland from floods, and helped ships navigate the rivers.
But this marvel had a hidden cost. Salmon are remarkable fish: they are born in rivers, swim out to live in the ocean, and then return to the very same river to spawn. Imagine a long road that salmon travel home along every year. Now imagine that a huge wall suddenly appeared in the middle of that road. To a salmon, a dam is exactly such a wall. Many rivers that once held abundant Chinook salmon are now either completely inaccessible to fish or only partially accessible.
Fewer salmon means less food for orcas. Scientists estimate that one adult orca needs to eat up to 30–40 large salmon a day. When there is not enough fish, the whales become weaker, females give birth to fewer calves, and some pregnancies are even terminated by starvation.
| Pod | Approximate number of individuals (according to the latest counts) | Distinguishing feature |
|---|---|---|
| J | about 25 | most often seen in Puget Sound year-round |
| K | about 16 | travels farther along the coast |
| L | about 32 | the largest, but a highly vulnerable family |
(The figures are approximate—the southern resident population is so small and vulnerable that every individual is counted by hand, and the numbers change almost every year.)
The Whale Who Wouldn’t Let Go
In 2018, the entire world took notice of an orca named Tahlequah, or J35. She gave birth to a calf, but it lived for only half an hour. Tahlequah would not let it go—she carried the calf’s body on her back for 17 days, traveling more than 1,500 kilometers. Scientists and journalists around the world followed her journey, and the story prompted many people who had never even heard of southern residents to learn about their plight.
“It was like a public mourning,” said one researcher from the Center for Whale Research. “It was as though she wanted the whole world to see what was happening to her family.”
After the incident, Washington state authorities began taking more active measures: they started studying the possibility of partially removing some old dams, launched river-restoration programs, and restricted vessel noise near the whales’ feeding grounds. Noise makes it harder for orcas to locate fish using echolocation.
A Lesson from the Past for the Future
The story of the southern residents reminds us that engineering decisions that seemed like excellent ideas a century ago can have unexpected consequences generations later. Dams gave people electricity and water, but they took away the salmon’s road home—and, with it, the orcas’ food.
Today, scientists, engineers, and ordinary Seattle residents are working together to address the consequences of those old decisions: building special fish ladders, removing some obsolete dams, and restoring rivers. It is slow and difficult work, but every river saved gives orcas a chance to become a large family again rather than a rarity watched with concern.
Perhaps that is why the story of Tahlequah and her family matters so much: it reminds us that even after many years, we can hear a signal from the past—and try to make things right.
