It started with a slow float. In a 2013 BBC documentary, a pod of adolescent dolphins was filmed gently passing a pufferfish between them. They didn’t bite or kill. They just nudged it, mouthed it, and then drifted near the water’s surface, as if mesmerized. One dolphin stared at its own reflection. Another hovered with half-closed eyes. The narration suggested something bold: the dolphins had figured out how to get high.

The claim lit up headlines and social media. Dolphins were using the pufferfish’s neurotoxin as a drug, the theory went. A little nibble here, a little toxin there. A hit passed from snout to snout. But behind the sensational framing was a deeper question scientists are still wrestling with: what, exactly, were these dolphins doing?

What the footage shows

The BBC crew used robotic spy cameras to blend in among the dolphins. What they captured was undeniable: a group of young bottlenose dolphins in Mozambique gently engaging with an inflated pufferfish for over 20 minutes. They didn’t eat it. They handled it delicately. Then came the odd behavior. The dolphins floated, seemingly dazed, noses up toward the sky.

To the film’s producers, it looked like the aquatic equivalent of a mellow trip. Zoologist Rob Pilley described the dolphins as appearing “tranced out,” comparing the moment to people mesmerized by their own mirror image. The pufferfish’s toxin, tetrodotoxin, was said to be the source of the experience.

It was a theory that stuck: dolphins use pufferfish for recreational intoxication. The meme practically wrote itself.

What the science says

Tetrodotoxin is no joke. It’s the same chemical that makes eating improperly prepared fugu fatal. Even in small doses, it can cause numbness, muscle paralysis, and a terrifying condition where a person is fully conscious but unable to move. It’s not known to cause euphoria. It doesn’t cross the blood-brain barrier.

Most experts agree: tetrodotoxin is about as far from a fun drug as you can get. It silences nerves. It doesn’t stimulate them. Christie Wilcox, a science writer with a background in toxicology, put it bluntly: “It’s a poison, not a party drug.”

There’s also the matter of risk. A small error in dosage could kill a dolphin. There’s no evidence dolphins have evolved any immunity to the toxin. If they were using it regularly, we’d likely see more incidents of distress or death. We don’t.

The case for curiosity

So what explains the behavior? Most marine biologists believe it’s about play. Dolphins are known for being socially complex, intelligent animals with a rich history of playing with objects and animals alike. They toss seaweed, blow bubble rings, ride waves, even use live fish as toys.

A puffed-up pufferfish? It’s a spiky, bouncy novelty. It floats. It reacts. For a young dolphin, it could be as irresistible as a beach ball. And the floating behavior seen after the encounter might not be euphoria. It might be fatigue, mild numbness, or simply rest after vigorous activity.

Researchers in Australia observed a young dolphin named Huubster engaging in a similar behavior with a local pufferfish. The team described it as jubilant play. They didn’t interpret it as drug-seeking behavior.

Even the BBC dolphins, skeptics argue, could have been experiencing a negative reaction rather than a pleasurable one. They may have handled the fish out of curiosity and learned quickly that it came with consequences.

What it reveals about us

The idea of dolphins getting high hits a nerve because it feels familiar. We see ourselves in them. Their intelligence, their curiosity, even their ability to get bored. The footage invites projection. If they’re like us, maybe they explore altered states too.

But science doesn’t bend to a good headline. Until there’s clear evidence that dolphins seek out pufferfish toxin for a specific effect, the more grounded explanation holds: dolphins like to play, and sometimes that play comes with unintended side effects.

Still, the moment captured on camera is a powerful one. It reminds us how much we don’t know about animal minds. It makes us wonder not just how dolphins behave, but why. What they feel. What they want.

Whether or not they’re getting high, they’re definitely making us rethink what play, curiosity, and consciousness might look like in the sea.