BTG flirts with gory death by waking hibernating bears and swimming with orcas, knowing that many animals kill for fun. Which murdered the intern?

All's fair in love — and group mating rituals. Witness the flamboyant flamingo, belly-flopping eagle ray and one seriously awkward field assistant.

New life can be brutal in Australia, where BTG chases numbats, sand sharks eat siblings in the womb, and newborn orcas keep mama awake for a month.

Turn up those beach vibes because survival can depend on smart slothfulness, especially when you're stranded on an island swarming with predators.

Fear can be your friend — just ask a spooked pangolin or a panicked Dietrich. Later, BTG reveals the traumatic basis of his worst baboon nightmares.

Welcome to a hairy new habitat: Hollywood. BTG unleashes black swans in a queer-critter TV segment. But can he flip the script on a killer cassowary?

Out to save a desert rain frog, BTG, Bonnie and Dietrich crash-land in Namib Desert, where they must munch on insects and have a blast in a sandstorm.

Taste drives all animals as the team searches for an elusive cheese hermit amid circling lammergeiers, fresh maggots and molecular gastronomy snacks.

This time, it's personal. Family secrets send the trio on dicey expeditions, into the jaws of wolves in the Yukon and the maws of hippos in the Congo.

Venomous lorises, vicious martens, zoologist influencers — the Himalayas abound with dangers. Still, the goatzilla, aka gnu goat, calls to BTG's team.

The gang gets revved for a Louisiana monster jam: Bonnie wants to expose the murder swamp's mysteries, and BTG hunts for aliens, as in alien species.

In Ethiopia, the wonders — and horrors — of nature come alive. Bradley gets elbow deep into his work while Dietrich monkeys around with Bonnie.