Stonefish are aptly named - they look exactly like stone, allowing them to blend into their surroundings and surprise unwitting prey.
When their parents abruptly stop feeding them, young gannets are forced to learn to fly - but with untrained wings and little wind, that's a tall order.
After millions of years of evolution, the world's fastest predators only need a fraction of a second to kill.
When the Green River Killer is convicted of murder, the FBI brings in Dr. Mary Ellen O'Toole, leading expert in psychopathy, to get the killer to confess to 44 unsolved homicides.
The cheetah may be the fastest animal around, but its speed comes with a price; if it runs for too long and gets too hot, its heart and brain will cook.
When a praying mantis is pregnant, it won't hesitate to eat anything it can reach with its killer grip - even other praying mantises.
Leopards can scale tree trunks and leap 20 feet in a single bound, but at night they really prove their abilities, moving silently on padded feet and stalking their victims with perfect night vision.
With giant teeth and a ferocious attitude, African tigerfish are dominant, terrifying predators; they've even been known to work together to take on larger land animals.
When a baby wildebeest gets separated from its herd, its instincts will tell it to approach any mammals around - but if the only animals in sight are lions, its instincts shouldn't be trusted.
With uniquely powerful eyesight and quick-moving rounded wings, the African goshawk has no trouble maneuvering through the jungle's branches in order to gather top speed.
While studying prisoners in 1980, psychologist Dr. Robert Hare developed the Psychopathy Checklist - a list that evaluates people based on twenty basic traits, including lying and lack of remorse.
For a limited time, the Hope Diamond will be on display in a temporary new setting designed by Harry Winston. See the dazzling new setting revealed inside the halls of Smithsonian's National Museum of Natural History.
Our film crew recreates the glamorous life of socialite Evalyn Walsh McLean. The one-time owner of the hope Diamond was rumored to occasionally display the Hope Diamond on the neck of her Great Dane.
Smithsonian scientists use cutting-edge technology to extract atoms from the surface of the Hope Diamond in hopes of unraveling its unique DNA.
Witness the Hope Diamond's epic journey, spanning eons, crossing three continents, and passing from kings to thieves to millionaires and into the halls of the Smithsonian.