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Experts answer more questions about the animal kingdom, including what lions are saying when they roar and what leafcutter ants do with all the leaves they collect

Why domestic cats have trouble getting down from trees and why kiwi birds lay monster-sized eggs compared to their size

The process that caterpillars go through to transform into magnificent butterflies while in their cocoon. Plus, the facts about cats' tongues

Why some cats are cross-eyed, how meerkats are able to eat poisonous scorpions and hippos' ability to sleep while holding their breath

Answers to more fun animal questions, such as how a squirrel is able to take on a dangerous rattlesnake, what makes eagles' eyes so powerful and why the planet is overrun with bugs

Animal questions answered, including why pandas are black and white, whether parrots know what they are talking about and how electric eels manage to not electrocute themselves

A dog needs knee surgery, meaning Dr Jeff may be its only hope. Dr Nichols and Dr Petra team up to fix a cat's broken elbow

Dr Jeff and his team battle to save a puppy with broken ribs and internal bleeding. Meanwhile, Dr Baier attempts surgery he has never done before to treat a family's beloved rat

After 25 years in a tiny clinic, the team moves to a new building with twice the space. Dr Jeff also makes a special connection with a dog owner

Birdie goes on a treacherous hunt to bring home meat for the family and save her chickens from slaughter. Later, Noah constructs an automatic diaper machine

A family survives in the Alaskan wilderness. As winter approaches, Billy faces a new medical crisis. Elsewhere, a storm forces Noah and Rhain Alisha to make a tough decision

The Browns struggle to finish their homes as the ground begins to freeze. Meanwhile, Rhain-Alisha goes into labour and the group race to be there for the birth

The Browns kick off an ambitious plan as Bear and the siblings throw caution to the wind on a critical first project disassembling and transporting a huge windmill

A hungry bear breaks into Noah's tent and terrifies the livestock. Later, the windmill assembly takes the siblings to dangerous new heights

After an emotional send off, Sara battles through a week of chaos, determined to achieve her goal of becoming the first American woman to win Dakar.

John makes an emergency trip to St. George Island to feed his hungry crew. Sig and Jake lure Bairdi crab to their own side of a maritime boundary.

Ciarán sets out to create a gothic-style bookshelf with a series of unexpected secret compartments that will test his cabinet-making skills

Builder Chase Morrill and his team rebuild an old oyster shack for a working farm. They have their tightest deadline to date and a budget of only $25,000.

A South African ranger and a Texan wilderness guide attempt to survive 21 days in a remote Thai jungle against relentless monsoons and king cobras.

As an Oklahoma warm front unleashes long-track tornadoes, one twister grows to EF-3 strength, destroying a weed farm and forcing Reed onto dirt roads.

Josh Gates explores weather-driven mysteries: the Donner Party disappearance, a secret Cold War base in the Arctic, and the ghost ship Mary Celeste.

Follows investigators as they reopen the investigation into the bizarre disappearance of 16-year-old Theresa Bier in 1987. Locals believe Theresa was abducted by Bigfoot

The science of astronomy. This edition explores new discoveries surrounding dark matter and energy

New discoveries reveal NASA's Cassini spacecraft's secrets, which explored Saturn and its moons until it vaporised in its atmosphere

Part one of two. Rick Petko gets a surprise when Paul Teutul Sr starts to build a bike for him. Mikey Teutul comes in to help and add a touch of inspiration

Part two of two. The team aims to finish the bike for Rick Petko. Design company Nub Grafix gives it an old-school feel, while Paul Teutul Sr collects the sissy bar

Buying goods from home

Buying goods from home

It's the 50th anniversary of one of British motoring's forgotten heroes, the Triumph Dolomite Sprint, so Mike and Elvis try to get their hands on one