Watch These Elephants Form an ‘Alert Circle’ as an Earthquake Shakes San Diego, Protecting Their Young at the Center Footage from the San Diego Zoo Safari Park shows the large mammals huddling together around the herd’s calves Elephants at the San Diego Zoo Safari Park huddled together, facing outward, in a behavior called an "alert circle" after an earthquake hit. Screenshot via San Diego Zoo Safari Park When a 5.2 magnitude earthquake shook their enclosure on Monday, a group of African elephants at the San Diego Zoo Safari Park instinctively sprang into action to protect each other. The moment was caught on the camera as the quake rocked Southern California, offering a rare glimpse at how elephants react to danger. In the footage, the large mammals run around initially, then older elephants Ndlula, Umngani and Khosi move to form a ring around calves Zuli and Mkhaya, in what experts call an “alert circle.” Zuli tries to stay on the outside with the adults, in an apparent attempt to act courageously. His mother and another elephant who helped raise him pat him with their trunks, as if to say: “Things are OK,” and “stay back in the circle,” as Mindy Albright, a curator of mammals at the San Diego Zoo Safari Park, tells Julie Watson at the Associated Press. Elephants are highly social animals, says Joshua Plotnik, an animal behavior researcher at Hunter College, to NPR’s Rebecca Rosman. Their instinct to band together is clear in the formation of the circle. “They bunch together, the adults on the outside facing out, and then they’ll push the younger individuals into the middle,” he says.Such a behavior is “a natural response to perceived threats that helps protect younger elephants and the herd as a whole,” writes the San Diego Zoo Safari Park on social media. “It’s so great to see them doing the thing we all should be doing—that any parent does, which is protect their children,” adds Albright to the AP. Research indicates African elephants can sense vibrations through their ears and feet. The massive animals create low-frequency seismic vibrations in the ground as they walk and vocalize. Other elephants may pick up on these signals, offering a long-distance form of communication. This ability likely helped them react to the quake. “For them to just be so in tune with their environment and paying attention to the environmental cues, it’s really something that you want to see them still hone in on,” Albright says to Kasha Patel at the Washington Post. “It’s a measure of their health to see them respond like this.” The footage is also a reminder of how much we still have to learn about the animals, adds Plotnik to NPR—and the importance of protecting them. African elephant populations have seen a drastic decline over the last 50 years. Asian elephant numbers, meanwhile, have dropped by half in three generations. “The Asian and African elephants are in imminent danger of going extinct, and it’s crucially important that we continue to learn more about their behavior and cognition if we’re going to come up with ways to protect them and conserve them in the wild,” Plotnik says to NPR. The behavior recently caught on video can offer scientists insight into elephants’ social responses to threats. An aftershock hit San Diego about an hour after the video was taken, and the animals repeated the behavior, according to the AP. But they went back to their daily lives once everything seemed safe. After the quake, the zoo writes, it was “business as usual” for the elephants again. Get the latest stories in your inbox every weekday.