Episode 3 around minute 35:00. mating between dolphins is implied, no sex organs shown. Scene is brief and non graphic

Episode 6: around minute 5 you see white birds mating. Thrusting is shown. Scene is brief

In Episode 6, Ice Worlds, you see penguins mating. In the same episode, birds are shown mating.

In Episode 8, Jungles, you see frogs mating.

In Episode 10, Seasonal Forest, two squirrels are shown mating, also a brief scene of cicadas mating.

Predatory animal violence.

Ass is said once in the episode titled Great Plains.

The animal deaths and animal violence can be frightening to younger audiences.