Eco-Heroes. Looking to help protect the planet, Cam, Tyler and Aaron take inspiration from the zoo's animal eco-heroes, including pygmy marmosets, Amur tigers and orangutans. [S]
Power Players. Meet the zoo's powerful animals as Sonika the Asiatic lioness gets a grip in a tug-of-war and Tyler takes on Marion the sulcata tortoise in a contest of strength. [S]
Perfect Dens. The brothers learn all about different types of cosy animal dens. Bird expert Nadeem helps Cam build a bird box, and Aaron reveals why the Asiatic lion is most endangered. [S]
Shy Guys. The One Zoo Three brothers meet the zoo's shyest animals as Cam is challenged to a game of spot the reptile, and Tyler tries to tempt Rambutan the binturong onto his new platform. [S]
Big Steps. Trying to solve the case of the mystery footprints, the brothers look at the animals' feet. Could it be the penguin chicks, the snow leopard cubs, or something far more peculiar? [S]
Squeaky Clean. While the brothers are making sure all the habitats are squeaky clean, they discover how much they can learn from the animals themselves, as they are nature's best clean-up crew. [S]
Go Slow. The brothers learn about animals that like to take things slowly. They discover the top speed of a giant African land snail and see just how slow a sleepy sloth can get. [S]
Cool Creatures. The brothers visit Belgium's Pairi Daiza Zoo to meet pandas, walruses, penguins and the golden takin, all animals that have adapted to survive in the coldest climates. [S]
Roommates. The zoo brothers take inspiration from animals that live together. Can they help the sun bears to share? And how will Kasanga the African lion get along with his new partner? [S]
Young Ones. The brothers meet the zoo's youngest animals as Cam helps give two snow leopard cubs a health check. And it's goodbye to Tashi the red panda as he begins a new adventure. [S]
Strong Swimmers. The brothers celebrate some of the zoo's strongest swimmers. Can Cam tempt the jaguars into their new pool? And who will win the tapir food raft challenge? [S]
New Habitats. The One Zoo Three zoo celebrates the opening of some amazing new animal habitats with a new den for the sun bears - but will the jaguars feature pad be a bit hit or miss? [S]
Saving Species. The brothers are at San Diego Zoo Safari Park to learn about saving endangered species. They come face to face with rhinos, giraffes and the California condor. [S]
Super Size. The brothers visit San Diego Zoo to meet some supersized species including the huge Komodo dragon, the majestic Andean condor and the awe-inspiring polar bears. [S]
Indian Celebrations. There's a festival vibe at the zoo with the arrival of two new Asiatic lions. Meanwhile, cute red panda cub Tashi gets a check-up. [S]
Hottest Day. On an extremely hot day at the zoo, the white-cheeked gibbons enjoy a puzzling picnic, Spike the bearded dragon visits the vet, and there is a warm welcome set for Kyra the sun bear. [S]
Great Shape. Cam weighs Womba the palm-sized possum, Aaron teaches the camel brothers some manners, and Tyler gets Griffin the caracal to take a giant leap. [S]
Family Legacies. Cam helps Amur leopard Luka look for love, Tyler reunites with Khumbu the snow leopard, and Aaron sees the rare black hornbill chick fly the nest. [S]
Animal Superstars. Find out if supersized anaconda Optimus Prime welcomes his new housemate. Tyler tries to outjump a springy serval cat, and Amur leopard Xizi has a big operation. [S]
Veggie Day. The brothers are delivering healthy greens to all the animals. Tyler's puzzle gives the lemurs food for thought - and who will win the bug hotel build challenge? [S]
Sensational Smiles. Tyler makes gummy treats for the pygmy marmosets, Cam takes Baikal the white tiger to the dentist, and Aaron attempts to stop the camels chewing their home. [S]
Reduce Recycle. The brothers check up on how green they have been. A tiger gets stuck into an old barrel, and a ring-tailed lemur has a special, sparkly snack. [S]
Vet Visit. It's vet day at the zoo. Kanu the penguin gets treated for his unhappy feet, Ellie the porcupine has an injection of confidence, and Xizi the amur leopard receives some sad news. [S]
Super Mums. The brothers celebrate Mother's Day. It's a big step for snow leopard cub Shen, jaguar Kiera has a break from daughter Inka, and is Tilly the red panda having a baby? [S]
Squeaky Clean. While the brothers are making sure all the habitats are squeaky clean, they discover how much they can learn from the animals themselves, as they are nature's best clean-up crew. [S]
Fright Fest. It's a Halloween spooktacular at the zoo as the animals receive some eerie delights. There are creepy pumpkins for the lions, but will the meerkats brave their haunted house? [S]
Go Slow. The brothers learn about animals that like to take things slowly. They discover the top speed of a giant African land snail and see just how slow a sleepy sloth can get. [S]
Cool Creatures. The brothers visit Belgium's Pairi Daiza Zoo to meet pandas, walruses, penguins and the golden takin, all animals that have adapted to survive in the coldest climates. [S]
Zoo Legends. The brothers celebrate some of the zoo's legends and hold a special birthday party for their oldest animal, Newt the gibbon. And Cam builds some new ramps for arthritic meerkat Freya. [S]
Roommates. The zoo brothers take inspiration from animals that live together. Can they help the sun bears to share? And how will Kasanga the African lion get along with his new partner? [S]
Training Day. Everyone at the zoo is put through their paces on a special training day. Aaron heads off to collect Nina the super-long anaconda, and Tyler tries to outsmart Tierra the caracara. [S]
Young Ones. The brothers meet the zoo's youngest animals as Cam helps give two snow leopard cubs a health check. And it's goodbye to Tashi the red panda as he begins a new adventure. [S]
Perfect Partners. It's Valentine's Day at the zoo, and the brothers prepare some tasty romantic treats for the animals - but will Cam find out who his secret admirer is? [S]
Team Vet. The One Zoo Three animals are due some check-ups. Is Ta'iri the leopard losing his eyesight? And what's the best way to take the entire meerkat mob to the vets? [S]
Strong Swimmers. The brothers celebrate some of the zoo's strongest swimmers. Can Cam tempt the jaguars into their new pool? And who will win the tapir food raft challenge? [S]
New Habitats. The One Zoo Three zoo celebrates the opening of some amazing new animal habitats with a new den for the sun bears - but will the jaguars feature pad be a bit hit or miss? [S]
Saving Species. The brothers are at San Diego Zoo Safari Park to learn about saving endangered species. They come face to face with rhinos, giraffes and the California condor. [S]
Superheroes. Cam, Tyler and Aaron want to hold a superhero-themed party inspired by the superpowers of the zoo's most incredible animals, including their camel's super-slurping suction. [S]
Super Size. The brothers visit San Diego Zoo to meet some supersized species including the huge Komodo dragon, the majestic Andean condor and the awe-inspiring polar bears. [S]
Sports Day. The One Zoo Three brothers join keeper Briony at the cat sanctuary, where the animals limber up for a wild day of sport and Jua the serval jumps for gold. [S]
Indian Celebrations. There's a festival vibe at the zoo with the arrival of two new Asiatic lions. Meanwhile, cute red panda cub Tashi gets a check-up. [S]
The Zoosical. The One Zoo Three brothers are on a mission to compose a zoo musical using the sounds of the animals, and Tyler takes on a breathtaking challenge with an anaconda. [S]
The Birthday. It's a day of new arrivals as one of the pygmy marmosets gives birth and the penguins lay eggs. It's also Tilly the red panda's birthday. [S]