Low
The overwhelming majority of life on Earth. Harmless to humans, and frequently far more interesting for it.
Humpback Anglerfish
The female wears a lure on her snout and can swallow a fish longer than herself.
Hydra
A small freshwater polyp whose death rate in lab studies stayed flat as it got older.
Immortal Jellyfish
A bell up to 3.3 millimetres wide that can turn back into a polyp instead of dying, in the lab at least.
Impala
An antelope whose leaps often carry it over bushes and even other impala, with scent glands under black hair on its hind feet.
Indian Peafowl
Iridescent member of the pheasant family whose feathers get their color from a two-dimensional photonic crystal, and whose train rattles out a broadband, pulsating sound.
Indian Star Tortoise
Thorn-scrub grazer wearing a starburst camouflage shell, and one of the world's most heavily traded tortoises.
Jaguarundi
Weasel-shaped cat with a bigger vocal repertoire than any other cat in its range, active by day while the margay works nights.
Japanese Spider Crab
The Pacific's leggiest scavenger: a giant crab known to grow up to twelve feet across, picking over the seafloor off Japan.
Kakapo (Owl Parrot)
The heaviest parrot in the world, camouflaged in moss-green feathers, betrayed by its own strong scent, and courting with a boom heard up to five kilometres away in ideal conditions.
Kea (Alpine Parrot)
A mountain parrot that matched human infants and chimpanzees on a probability test, and was persecuted as a sheep killer for over a century.
King of Saxony Bird-of-Paradise
A male's twin head plumes run twice his body length, worked by muscles housed in hollows of his skull, and his courtship song has been likened to radio static.
King Penguin
Sub-Antarctic penguin with an orange neck patch reaching its upper breast, second largest of all penguins, and a deep diver: tracked birds have gone past 240 meters.
Kinkajou
A nocturnal canopy climber that twists 180 degrees between pelvis and head, can hang by its tail and reaches nectar with a 13 cm tongue.
Koala
A slow-motion marsupial that sleeps up to 22 hours a day and leans on gut bacteria to live on eucalyptus leaves most herbivores can't tolerate.
Koi
A pet carp bred into over 100 colour varieties that, in one study, sought out a human hand.
Lar Gibbon
A rainforest singer whose pair duets average 11 minutes and carry up to a kilometre.
Laughing Kookaburra
World's largest kingfisher, the bush's dawn alarm clock, and a snake-smashing hunter.
Leafy Seadragon
Seaweed-like flaps, transparent oscillating fins, and a sway like plants in the current.
Least Weasel
Weighing as little as 30 grams, it kills prey larger than itself and can eat over half its own body weight in a day.
Leatherback Sea Turtle
The only sea turtle with no hard shell, and big enough to keep its core warm in near-freezing seas.
Leopard Gecko
A desert gecko with movable eyelids, no sticky toe pads, and a dropped tail that keeps moving for up to 30 minutes.
Llama
A woolly Andean pack animal that makes heavy chain-only antibodies, one of which, raised by immunization, neutralized 96 of 100 HIV-1 strains tested.
Long-Bodied Cellar Spider
The ceiling spider that raids other spiders' webs and spins itself into a blur when threatened.
Long-Tailed Chinchilla
An Andean rodent with up to 60 hairs growing from one follicle.