Can the Amazon of Southeast Asia Be Saved? loading...
Can the Amazon of Southeast Asia Be Saved?
The Mekong River Basin supports millions of people and some of the world’s richest biodiversity, but it must overcome many threats.
One of the World's Weirdest Fish loading...
One of the World's Weirdest Fish
What in the world is a hagfish?
See Award-Winning Underwater Photos From Around the World loading...
See Award-Winning Underwater Photos From Around the World
These 13 photos were among those recognized by the Underwater Photographer of the Year contest, which showcases the best in underwater photography.
World's 7 Most Romantic Animals loading...
World's 7 Most Romantic Animals
For Valentine's Day, we have a collection of remarkable videos celebrating love in the natural world.
One Fish Frozen While Eating Another—A Rare Discovery loading...
One Fish Frozen While Eating Another—A Rare Discovery
Two brothers set out to videotape their rare find from an ice fishing trip, which has gone viral.
7 Amazing Animal Organs People Don't Have loading...
7 Amazing Animal Organs People Don't Have
Under-eye "flashlights," venom glands, claspers. Nature abounds with body parts that aren't found in humans.
Ruby Seadragon Caught on Video for First Time in Western Australia loading...
Ruby Seadragon Caught on Video for First Time in Western Australia
The scarlet fish was declared a new species in 2015—but before this footage, it had never been seen alive.
14 Not-Fake Shark Pictures From a Real Nat Geo Photographer loading...
14 Not-Fake Shark Pictures From a Real Nat Geo Photographer
A phony photograph of a shark is the latest in a year of fake news. But these images are all real.
New Giant, Air-Breathing Fish Discovered loading...
New Giant, Air-Breathing Fish Discovered
Several other species of arapaimas are likely lurking in the Amazon, waiting to be identified.
800-Pound Groupers Making a Comeback—But Not Everyone's Happy loading...
800-Pound Groupers Making a Comeback—But Not Everyone's Happy
Some Florida fishermen say Atlantic goliath groupers are eating too many fish, but scientists argue the behemoths still need our protection.
Tracking the Secret Lives of Ocean Predators loading...
Tracking the Secret Lives of Ocean Predators
Cutting-edge technology used by marine biologist Barbara Block is leading to more knowledge about sharks and bluefin tuna.
About the Show
Dr Zeb Hogan, National Geographic Explorer and an aquatic ecologist goes on his journey to find the largest freshwater fish in Australia – the freshwater sawfish, a cross between a shark and a chainsaw. These amazing monsters are nearing extinction but our continent is a stronghold for this elusive fish. Zeb gets in the water to learn about the sawfish's amazing hunting technique, stunning prey with its saw-like rostrum and then eating it whole. Zeb teams up with a local scientist, David Morgan and the indigenous Jarlmadangah Rangers, to catch and study the monstrous sawfish in the Fitzroy River in the country’s northwest. Zeb travels deep upstream into the desert where freshwater pools hide huge predators like the saltwater crocodile and bull sharks. Zeb and the team follow the sawfish migration from the estuary upstream and back again until they return to the sea. He tags and releases many sawfish, from a month old baby to a 2.2-metre megafish on its way to the ocean where it could someday grow to be a monster 7-metre fish.

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