The series gained worldwide acclaim for several "first-ever" filmed behaviors:
: The discovery of a new species of hairy-chested crab, nicknamed after David Hasselhoff. Episode Guide Blue Planet II
: A female kobudai that undergoes a biological transformation to become a male. The series gained worldwide acclaim for several "first-ever"
: Broadclub cuttlefish that use flickering skin pigments to "hypnotize" and stun crabs. Blue Planet II
: Tuskfish that use coral "anvils" to smash open clam shells.
: Giant trevally leaping out of the water to catch low-flying terns in mid-air.