No idea. This is a spoof from the movie, Tusk.

Stupid animals. Walrus commit mass suicide.

The Walrus go to the beach to tan. Laze about in their blubber. But they're territorial animals. One bull male gets a large harem. It makes the real estate tight. Real tight. So they start to climb up glaciers when the population is everywhere. Sometimes to escape the polar bear. No they tend to choose beaches more secluded, and they can quickly get to sea. But they're a walrus, and it's much easier getting up the glacier. Then when they go to climb back down, it's mass suicide, like computer game lemmings.

The walrus is probably the dumbest animal on the planet. It commits mass suicide, everytime it beaches, dozens plunge to their deaths. No explanation for this apart from the walrus suicide cults. No predator, no threats, the walrus will kill itself.

Out of all animals, apart from Whales who do this, beach. There isn't much of an explanation on why the walrus kills itself? Real estate tight, climbs cliff and glacier, no intention of climbing back down, it hasn't got the physique, instead it just leaps to its death, in numbers, dozens at a time. Seals don't do this. More predators. They fight to live. Some are more territorial like elephant seals. But walruses just get fatter and stupider.

Perhaps it's because there are few polar bears. And not enough whales eating them. Like in the other pole? Who knows why the Walrus does this. Climbs cliffs to die? They will also physically hurt themselves climbing cliffs, the jagged scree scratching at their blubber, drawing blood. There was no need, apart from the real estate was tight, but they beach together, then it's jump off cliff to death, they bled to climb.

Herd animals, have a generic programming one can only guess. Without a few dying, the herd is more endangered, by dying it provides a bounty to other animals. Many herd animals act quite dumb, like the migratory river crossings, they know they'll die, but the herd must cross. Because the herd will cross, the predator knows to ambush? Programming.

Walrus beat common sense. No need. Apart from the real estate was cramped. Without some dying this way, all the other ecosystems wouldn't get fed? Who knows.