While BBC America sticks with the classics — marathons of 2007’s Planet Earth (6am/5c) and 2018’s Planet Earth: Blue Planet II (5/4c) — National Geographic and Nat Geo Wild celebrate with three premieres. Here’s a primer:

Wild Coasts

For those who enjoy the hunt: A four-minute sequence of a leopard seal taunting a gentoo penguin in Antarctica (it escapes!) is as jaw-dropping as a jaguar ambushing a caiman in Brazil.

Wild Coasts Premiere, Friday, April 22, 6/5c, Nat Geo Wild

Secrets of the Whales

This four-part stunner from James Cameron, which debuted on Disney+ last year, airs now as a marathon. Learn how different pods of orcas hunt and some male humpbacks create a new song each year and spread it around the globe. Plus, why families of chatty belugas stage an annual reunion and how clans of sperm whales (right) bicker in their own unique language!

Secrets of the Whales Premiere, Friday, April 22, 7/6c, National Geographic and Nat Geo Wild

Gorongosa: Paradise Reborn

The story of species being reintroduced to Mozambique’s war-ravaged park is chilling (elephant survivors remember) but overwhelmingly inspiring.

Gorongosa: Paradise Reborn Premiere, Friday, April 22, 11/10c, National Geographic