Earth, Laniakea Supercluster—It’s as if Alfonso Cuarón wrote and directed Y Tu Mamá Tiburón instead.

A remarkable underwater scene captured on video off the coast of Australia has provided the first visually documented instance of a “threesome” mating among the endangered Indo-Pacific zebra shark (sometimes referred to as a “leopard shark.”). The video, filmed by marine biologist Hugo Lassauce of the University of the Sunshine Coast (UniSC), shows two male sharks sequentially mating with a single female on the sea floor, a behavior never before observed in the wild for this species.

Lassauce and his team had been monitoring shark aggregations offshore for over a year when, during a July 2024 dive, they witnessed two males grasping the female’s pectoral fins with their mouths and holding her on the sand below.

“It’s rare to witness sharks mating in the wild, but to see it with an endangered species – and film the event – was so exciting that we just started cheering,” Lassauce said in the UniSC press release.

It was definitely more of a sprint than a marathon for the two eager fellows. The first male’s mating lasted 63 seconds, the second 47, and afterwards both males lay motionless while the female swam off. Diego Luna and Gael Garcia were a bit more compassionate.

Performance aside, the observation could also inform conservation efforts noted UniSC senior researcher Christine Dudgeon.

“From a genetic‐diversity perspective, we want to find out how many fathers contribute to the batches of eggs laid each year by females,” she said.

As well, the aggregation site documented in this encounter may represent a critical mating habitat for the species, which is endangered in much of its range. While sharks mating in groups is not wholly unknown, it has never before been documented for this species, which typically has little known wild mating behavior.

Still, the footage offers novel insight into reproduction patterns for the zebra shark, potentially aiding artificial‐insemination and rewilding programs. Some scientists suggest that, despite their stealthy nature, such behaviors could be more common than realized and are simply rarely recorded.

Turns out, what happens on the sea floor only stays on the sea floor until a marine biologist with a camera shows up while nature is getting freaky.