1 :01x01 - Blood Squirting Lizard

Naturalist Nick Baker hunts down the planet's strangest animals, beginning with the horned lizard, an American reptile which blows up like a spiky balloon to protect itself and can also squirt blood from its eyes. He also explores the flora and fauna of the Sonora desert, such as the cholla cactus, which stores deadly poison in hundreds of hooked spines

2 :01x02 - Vampire Fish

The naturalist travels to Peru in search of the vampire fish, a parasitic creature that lurks beneath the surface of the river and feeds on the blood of other fish. It is alleged the candiru fish is attracted to urine and is allegedly capable of swimming into the human urethra, where it becomes lodged. Nick is joined by a local expert as he observes the creature, before investigating a suspected case

2 :01x02 - The Olm

3 :01x03 - Pink Fairy Armadillo

Naturalist Nick Baker continues to seek out the world's strangest creatures, going on the trail of an armour-plated mammal known as the pink fairy armadillo. The team travels to the Mendoza province in western Argentina in the hope of glimpsing the rarely seen animal, following in the footsteps of Charles Darwin, who visited the area on his Beagle voyage 172 years ago

4 :01x04 - Saggy Skinned Frog

The naturalist seeks out the giant saggy-skinned frog of Lake Titicaca in South America. He begins his research at London's Natural History Museum, hoping to find the amphibian whose natural habitat is two miles up in the Bolivian Andes. The team follows in the footsteps of Jacques Cousteau, who visited the area in the early 1960s. However, finding the creature proves a mammoth task as altitude sickness slows the group down

5 :01x05 - The Croc From Mars

Nick Baker travels to India to seek out the gharial crocodile, which may be descended from the baryonyx, a dinosaur with an elongated jaw whose diet also consisted of fish. The rare creature can grow up to six metres in length, and has developed a fleshy growth called the ghara, located on the end of the snout in adult males. However, the function of the odd protrusion remains a mystery

6 :01x06 - Basking Shark

The naturalist goes in search of the basking shark - the second largest fish in the world and as long as a London bus. Cornwall is statistically the best place to spot the creature in the UK, but bad weather forces Nick and the team to follow the warm water as the shark moves north over the summer, when they are subjected to a series of bumpy rides off the coast of western Scotland

7 :01x07 - Star Nosed Mole

The naturalist travels to Manitoba in Canada to track down the star-nosed mole, whose 22-tentacled snout enables it to assess and devour small pieces of food in less than a quarter of a second. Nick and the team face hot, mosquito-ridden conditions as they attempt to trap the creature in its marshy habitat

8 :02x01 - The Human Fish

Nick travels to Slovenia to find the mysterious olm, a fish that lives in total darkness. Dubbed the "Human Fish" because its colorless skin resembles human flesh, the olm has adapted to one of the most extreme environments on the planet.

2 :02x02 - The Real Gremlin

Naturalist Nick Baker encounters the tarsier in the remote jungles of south-east Asia, a creature with an uncanny resemblance to the mythical gremlin. Starting in the Tangkoko nature reserve on the Indonesian island of Sulawesi, he begins his search for the elusive carnivorous primate

2 :02x03 - The Swamp Thing

Naturalist Nick Baker goes in search of the alligator snapping turtle in the swamps and marshlands close to the Louisiana city of New Orleans. The creature has powerful claws and jaws and a bite that's among the most vicious in the animal kingdom, easily surviving natural threats such as hurricane Katrina

2 :02x04 - The Hellbender

Naturalist Nick Baker visits America, where he encounters rare giant salamander the hellbender, a creature with a reputation as a poisonous menace to the local fishing industry. Starting in the Ozark region of Missouri, he investigates the causes of a severe drop in the local population, a problem which has the authorities stumped

12 :02x05 - The Invisible Lizard

13 :02x06 - The Frankenstein Fish

Nick hooks up with his father, Steve, an experienced angler, to help him track down the biggest freshwater fish in the western world, the wels catfish. Until this journey his father’s record catch had been a five-pound brown trout, a record soon blown out of the water as Steve hooks an 80-pound monster catfish.

14 :02x07 - The Night Stalker

Nick is in Madagascar and he’s about to come face to face with one of the weirdest creatures he’s ever laid eyes on. The Aye-Aye is a nocturnal lemur that looks as if a taxidermist has tagged on spare body parts from many different animals – bat ears, rodent teeth, a squirrel tail and a scary middle finger!

15 :02x08 - The Mimic Octopus

Nick dives into the fertile waters of the Lembeh Strait in Sulawesi, in search of a very convincing disguise artist - the mimic octopus. Allegedly capable of 15 impersonations, this octopus can shift both shape and color to resemble a lionfish, sea snake, coral and flatfish!

16 :03x01 - Leafy Sea Dragon

The Leafy Sea Dragon has a jewel-like body and complex camouflage

17 :03x02 - Mole Lizard

The elusive mole lizard of Mexico's Baja peninsula.

18 :03x03 - Axolotl

The naturalist visits Mexico City, the home of the rare axolotl and a salamander whose unique biology could mean advances in medical science

19 :03x04 - Marsupial Mole

The naturalist travels to Australia's Red Centre to find the marsupial mole

20 :03x05 - Slow Loris

The naturalist travels to the Borneo jungle to find the Slow Loris, the world's only poisonous primate

21 :03x06 - Horseshoe Crab

The naturalist goes in search of the horseshoe crab to find out why the living fossil has survived for so long and what new dangers threaten its future

22 :03x07 - Anteaters

The naturalist tries to find the tamandua, an awkward relation of the anteater, and witnesses behaviour by the animal never before seen in the wild

20 :03x08 - Pygmy Sloth

Naturalist Nick Baker travels to a group of islands in Panama to find the pygmy sloth and discovers a frog with an identity crisis