Dr. Craig O'Connell and Andy Casagrande travel up the Serena River to try and find out why young bull sharks swim up the river, and how they avoid the crocodiles living there.

Journey around the world and discover how dogs became one of the most valued animals on the planet. From wild predators to friendly pets- this is the story of man's best friend.

Jeremy heads to Australia to investigate an underwater attack. Could it be the work of a giant fresh water predator that many believed to be extinct?

Officers move in to close down a shelter housing hundreds of cats. Some of the animals are already dead and the team must act quickly to save the others.

When trainee agent Derrick Schlitter responds to an emergency call in north Philadelphia, he ends up seeking justice for a puppy left dead in a backyard.

Paul de Gelder and James Glancy bail out of an aircraft at 3500-ft to experience what it's like to crash land into some of the world's most remote and shark-infested waters.

As the Browns struggle to get their house built, winter arrives. While working through the snow, a series of setbacks threatens to derail all the hard work.

Jackson meets Tara, whose cat, Cali, will not tolerate strangers. Plus, Kurt's cat, Kurtis Jnr, destroys and eats everything in sight.

The spring mating season has begun and 15 cubs need to be born each year to sustain the population of captive pandas. Also, travel to the Qinling Mountains to watch wild pandas.

Gordon Buchanan searches majestic Vladivostok for the Russian Tiger and meets the people who live with these elusive beasts.

Engineers are working on streamlining vehicles to improve fuel consumption and speed. Plus, a solar-powered car competes in an endurance race.

The team lend a hand at Lakota Reservation in South Dakota. Back at the clinic, Amy debates emergency surgery for a French bulldog who ate his favourite toy.

Grammy-nominated rockstar and former Guns N' Roses guitarist, DJ Ashba, shows up at ATM and asks Brett and Wayde to build him a creepy skull-themed aquarium.

Wildlife agents are called out to rescue a black bear that has been hit by a car. Meanwhile, investigators confront the owner of an illegal pig slaughter operation.

When a CCTV camera films a man beating a cat, investigators have to catch him. Neglect leaves two dogs near death and owls are rescued from a demolition site.

Meet the lizard obsessive who changed his name to Mr Lizard Lover and found fame taking photos of his scaly friends posing as humans.

Behind modern Dubai lies a hidden treasure - an incredible wildlife that speaks of a timeless connection to the desert, the sea and the history and tradition of its people.

Pete goes to Walden, NY to build a treehouse tasting room for Angry Orchard. The pavilion-style structure will give views high above the acres of apple trees.

Villalobos' oldest resident, a pit with severe arthritis, is rehomed. Earl works to improve a dog's social skills and Kanani's girlfriend takes on her first rescue.

A violent feline threatens to drive a couple apart and a cat adopted from a local shelter proves to be a poor choice. Will Galaxy turn things around?

The spring mating season has begun and 15 cubs need to be born each year to sustain the population of captive pandas. Also, travel to the Qinling Mountains to watch wild pandas.

Tigger the cat is monitored closely for unusual eating habits. Plus, Dr. Jeff cautions an owner of the perils of buying online when she brings in her unwell puppy.

The Raneys must move an entire cabin into the flood zone as Marty's dam is put to the test. The surprise arrival of chicks means the coop needs an upgrade.

Rob and Elle investigate a claim about dogs on a hot roof. Meanwhile Brian and Face help a woman whose neighbour is provoking her dog.

As the Browns struggle to get their house built, winter arrives. While working through the snow, a series of setbacks threatens to derail all the hard work.

Scientists around the world are working on projects dealing with space and space travel - extraterrestrial life, colonising Mars, the Big Bang and rocket development.

There's heartbreak as investigator Labrada fights to save a poorly dog that's been rejected by its owners. Plus, a young girl rescues a horse left without food or water.