Watch Secrets of the Elephants, a four-part National Geographic series streaming on Disney+. “They’re all in trouble,” says Kenyan ecologist Paula Kahumbu. “All elephants are in major ...

But that’s just the start. “Secrets of the Elephants” — 9-11 p.m. Friday and Saturday on the National Geographic Channel, then on Disney+ — shows that they, like us, vary by location.