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National Geographic Wild X Files investigates some of the strangest mysteries in the natural world, from bizarre animal encounters and unexplained wildlife deaths to unusual natural phenomena. Each episode examines puzzling events reported around the world, exploring possible scientific explanations through investigation and evidence. Cases include mysterious creatures washed ashore, giant spider webs, exploding toads, unusual animal behaviour, unexplained animal deaths, and extraordinary events involving wildlife.
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2012

Investigators examine a strange, unidentified creature that washed ashore at Montauk, Long Island. The investigation explores the creature's possible identity and the evidence that might explain this unusual discovery.

In 2007, a giant web engulfed a forest in Lake Tawakoni State Park, East Texas. What creature was behind the web – and why was it spun?

Investigating the mysterious death of a number of toads in Hamburg, Germany in 2005, all of whom died by spontaneously exploding.

In Scotland, a reporter uncovers a 60-year history of dogs leaping from the same bridge. In India, a strange boom is heard and red rain falls.

In 2003, predatory Humboldt squid threaten the fisheries of California's Monterey Bay. Plus, a plague of mice hits Australia.

A six-foot-long creature is launching itself at pigeons from a Spanish river. Journalist Andy Allen investigates.

2013

In New Zealand, dozens of dogs fall violently ill after visiting the same beach. Plus, mysterious moving rocks, and cheetahs with eye injuries.

In the Cotswolds, a mystery beast stalks a walker and her pet dog, while in Florida a popular surfing spot is the world's shark-bite capital.

Hundreds of silver fish rain down on a remote community in Australia, whales seem determined to strand themselves, and Alpine ibex scale a dam.

Over Florida, a military jet hits something at 1500 feet, and DNA suggests it was a reindeer. In Africa, elephants attack baobab trees.

On New Year's Eve in Arkansas, 5,000 blackbirds fall from the sky. Meanwhile, in Scotland, a hiker stumbles across a strange translucent jelly.

Does a Loch Ness-style monster exist in Lake Champlain? One scientist believes she has evidence. Plus, a mysterious spiral light in Norway.

In Minnesota, a strange hairless creature is found by the side of a road. In Canada, salmon numbers fluctuate crazily.