Photo of the day

Forests Pink River Dolphins. This is from Untamed Americas.

A single buffalo (Syncerus caffer) is seen in tall grass. This is from Killer Safari.

The painting of "Our Lady of Cz?stochowa" which sits at the heart of Jasna Gora Monastery, Poland. In 1655 the monastery defended itself against an onslaught from the Swedish army. This is from Defending Europe.

A leopard (Panthera pardus) lies on a tree branch. 

A herd of buffaloes (Syncerus caffer) graze in an open grassy area.

Known as Mountain lions in the deserts and Pumas in the tropical rainforests of the America's. These big cats have the largest known habitat of any of the big cats ranging fro Northern Rockies to the tip of South America. This is from Untamed Americas.

Jewelry designer, historian, scientist and a New York Times best-selling author Aja Raden poses for a portrait during an interview for "Killer Lies: Chasing a True Crime Con Man," a documentary series about obsession and deception, following the unraveling of Stephane Bourgoin’s career as a best-selling author and serial killer expert. This is from Killer Lies.

Claudio Lozano stands on the deck of a Puntales ship, standing by the mast. The ship was used to defend against the french navy in the penninsular war in Spain. This is from Defending Europe.

A CBP officer holds drug paraphernalia found among a passenger's belongings in El Paso. Texas. This is from To Catch a Smugler Season 7.

A close-up view of a lioness (Panthera leo) shows her sharp teeth as she stretches her jaw to yawn.

A cheetah (Acinonyx jubatus) looks around as it walks about on the grassy field.

Jaguars are still common in the jungles of Southern Mexico and Central America. This is from Untamed Americas.

Photo Descriptor Stéphane Bourgoin poses for a portrait with convicted killer Gerard Schaefer after Bourgoin interviewed him in 1991. "Killer Lies: Chasing a True Crime Con Man" is a documentary series about obsession and deception, following the unraveling of Stephane Bourgoin’s career as a best-selling author and serial killer expert. This is from Killer Lies.

Redsands Forts is seen in an aerial view in Kent, UK. This is from Defending Europe.

Air Enforcement Agent Murray is holding his helmet as he walks across a tarmac to a CBP air vehicle in San Diego, Calif. This is from To Catch a Smugler Season 7.

A leopard (Panthera pardus) cuddles with her young cub.

Andy with a torpedo. This is from Defending Europe.

Stéphane Bourgoin is pictured outdoors during the production of "Killer Lies: Chasing a True Crime Con Man," a documentary series about obsession and deception, following the unraveling of Stephane Bourgoin’s career as a best-selling author and serial killer expert. This is from Killer Lies.

Arthur Williams points at a Renault Char B1 tank. This is from Defending Europe.

Multiple packages of methamphetamine were discovered by HSI in a duffle bag in the trunk of a suspect's vehicle during an operation in Orange County, Calif. This is from To Catch a Smugler Season 7.

A wild dog (Lycaon pictus) looks ahead.

Jaguars are still common in the jungles of Southern Mexico and Central America. This is from Untamed Americas.

The New Yorker staff writer Lauren Collins and author and renowned serial-killer expert Stéphane Bourgoin pose for a portrait during the production of "Killer Lies: Chasing a True Crime Con Man," a documentary series about obsession and deception, following the unraveling of Stephane Bourgoin’s career as a best-selling author and serial killer expert. This is from Killer Lies.

Arthur Williams is pictured at Ouvrage Schoenenbourg in Eastern France. This is from Defending Europe.

A stack of undeclared currency was placed in an evidence bag on an inspection table after it was found in a suspect's belongings in El Paso, Texas. This is from To Catch a Smugler Season 7.

A young elephant (Elephantidae) walks close to its mother.

Tony Pollard in the library at Jasna Gora Monastery, Poland. In 1655 the monastery defended itself against an onslaught from the Swedish army. This is from Defending Europe.

Claude Marie poses is interviewed for "Killer Lies: Chasing a True Crime Con Man," a documentary series about obsession and deception, following the unraveling of Stephane Bourgoin’s career as a best-selling author and serial killer expert. This is from Killer Lies.

A reenactor firing a musket at Belfort Citadel, France. The iconic site played a vital role in the Franco-Prussian war. This is from Defending Europe.

Air Enforcement Agent Murray walks across a tarmac to a CBP air vehicle in San Diego, Calif. This is from To Catch a Smugler Season 7.