"Sir David Attenborough uses this episode to investigate two animals who are capable of true virgin birth - the production of offspring without the need for sex."

"This episode explores the story of two animals that hide behind seemingly impregnable coat of arms. Can Sir David Attenborough get in behind their armour and reveal their mysteries?"

"Sir David Attenborough continues to shine the spotlight on nature's most amazing animals this time looking at the vision in squid and owls. Perhaps not a classic pairing, both owls and squid have incredible adaptations for being able to navigate at night."

"Here we discover that some animals are able to trick others into believing they are something that they are not. The art of deception is a powerful attribute for some."

"After initially gaining frightening reputations, it's now known that gorillas and bats are a lot gentler and considerate than their early reputations suggest."

"Plants and animals have some curious super senses that enable them to see, hear and feel things that are quite invisible to us."

"In this episode we explore the remarkable adaptations of two creatures that have evolved to survive the most challenging of conditions and seem to defy the laws of nature."

"We'll find out how nature is incredibly inventive and has produced two unique mechanisms of natural construction that have fascinated scientists for centuries; weaving in birds and silk."

"\"Strange Parents\" asks how we usually recognise animals as either male or female and how each sex normally plays a particular role in their own life cycle.\n\nHowever both hyenas and seahorses completely break the gender rules."

"\"Magical Appearances\" explores how swallows magically appear each spring and asks how did complex and beautiful insects like butterflies suddenly arrive in the summer.\n\nThe discovery of the swallow\u2019s epic migration and the revelation that butterflies could metamorphose into totally different looking adults were scientific stories both cloaked in mystery and controversy."

"Fleas are supposed to be able to jump the equivalent of a human leaping over St. Paul\u2019s Cathedral and cheetahs purportedly can clock speeds of 70 miles per hour. But are these claims really true? The discovery of the world's most elastic natural protein in insects and the development of a hi-tech tracking collar have helped reveal the truth. So can these creatures really achieve what should be physically impossible?"

"Orangutans can use tools but such skills remained undiscovered for centuries. They were considered as just clever mimics until discovery in remote Sumatran swamps revealed their true potential. Clever crows also make surprisingly sophisticated tools. How have the curious minds of these two animals helped them become so inventive?"

"The bodies of some animals stretch and shrink in extraordinary ways. The anaconda can swallow prey twice its own body size - and then wait for over a year until their next meal. The camel\u2019s curious hump can almost double in weight giving it the energy to travel huge distances across deserts. What is the secret behind these expandable bodies?"

"The blue whale and the flamingo both have bodies determined by their diet. Blue whales grow enormous by feeding on tiny shrimp-like creatures, while flamingos spend their lives eating with their heads upside down. Both are oddities in their own groups and yet both are curiously similar."

"Humans are not alone in using medicines against injuries and infection. Some animals protect themselves with natural remedies in the most extraordinary ways. Hippos produce a blood-red \u201csweat\u201d that acts as a sunblock and helps fight infections, while capuchin monkeys rub themselves with insect-repellent leaves to protect against insect bites. "

"Hybrids can be bizarre and they can be deadly. We look at two hybrid animals that owe their existence to human interference \u2013 the pizzly bear (a cross between a polar bear and grizzly), which has come into being because of global warming, and the killer bee brought into existence because of the transfer of African bees to South America."

"Some animals have an extraordinary ability to find their way. The dung beetle, an insect revered by ancient Egyptians, uses the sun, the moon and even the Milky Way to move its prized ball of dung in the right direction. Pigeons are often considered feeble birdbrains, but they have incredible memories that can recall several complex travel routes with amazing accuracy and they even use manmade roads and hedgerows to find the quickest way home."