The first thing you notice is the eye. A dark orb, weathered by a lifetime at sea, hovering just beneath the surface. It rises slowly alongside the boat until it is close enough to meet your gaze. For a brief moment, there is nothing else: no cameras, no engines, no excited whispers from fellow passengers. Just a whale.

Then, with a gentle roll of its body, it moves even closer. It’s an encounter that feels impossible. We are accustomed to wildlife keeping its distance. Wild animals flee from our presence, vanish into forests, disappear beneath waves. Yet here, in the sheltered lagoons of Baja California in Mexico, one of the largest animals on Earth appears to be doing the opposite. It is approaching us.

Every winter, thousands of grey whales complete one of the longest migrations in the animal kingdom, travelling up to 10,000 kilometres from their feeding grounds in the Arctic to the warm, protected waters of Baja California. Here, mothers give birth, calves take their first breaths and entire generations begin the long journey north.

For many visitors, the migration itself is remarkable enough. But it is what happens within these lagoons that has transformed this corner of Mexico into one of the most extraordinary wild places on the planet. Grey whales frequently approach boats voluntarily. Mothers guide curious calves towards visitors. Juveniles linger alongside vessels. Eye contact is exchanged at arm’s length. Encounters unfold not because people pursue the whales, but because the whales choose to come closer.

To understand why these interactions are so significant, it helps to understand how close grey whales came to disappearing entirely.

The whales that refused to vanish

Long before tourists travelled to Baja in search of whale encounters, whalers came in search of oil.

The sheltered lagoons that now provide sanctuary for mothers and calves were once hunting grounds. During the 19th century, commercial whalers discovered the calving lagoons of Baja California and quickly recognised their value. Mothers nursing young calves were particularly vulnerable. Protected from ocean swells and concentrated within relatively small areas, they became easy targets. The slaughter was devastating.

By the late 1800s, grey whale numbers had plummeted. Whalers referred to them as “devil fish” because mothers fiercely defended their calves, often attacking whaling boats in desperate attempts to protect their young. Yet this instinct alone could not withstand industrial hunting. Entire populations were pushed towards collapse. For decades, the future of the species looked uncertain.

The turning point came in the 20th century with increasing international protections and the eventual end of commercial whaling. Gradually, grey whale numbers began to recover. What followed became one of the most celebrated conservation success stories in marine history.

Today, the Eastern North Pacific grey whale population is estimated to be in the tens of thousands, representing a dramatic recovery from historical lows. While challenges remain – including climate change, shifting food availability in Arctic feeding grounds and periodic population declines linked to environmental conditions – the species stands as a powerful example of what recovery can look like when exploitation is replaced by protection.