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Millions of years evolution have created unique creatures found only in New Zealand – and many of them share an unusual trait.

They’re living giants.

In New Zealand, a spikey grasshopper-like creature, the Giant Weta, can grow as big as a rat. These islands are home to some of the biggest birds ever known, giant centipedes and carnivorous snails, and a two metre long lake monster capable of slithering its way across beaches – the gigantic longfin eel.

In neighbouring Australia we’ll descend caves to find the remains of extinct giant kangaroos and marsupial lions.

What advantage would animals have to grow so large? And why did Australia become a land of giant marsupials, while New Zealand developed giant birds, insects, and fish?

From the slopes of an extinct volcano to frigid glacial lakes, we’ll join researchers searching for clues.