As cinemagoers around the world marvel at the new superhero movie Black Panther, we here at National Geographic wanted to share some facts about these real-life fascinating felines.

First things first: a 'black panther' is not its own species—it's an umbrella term that refers to any big cat with a black coat. (Learn more about National Geographic's Big Cats Initiative.)

The condition is caused by the agouti gene, which regulates the distribution of black pigment within the hair shaft, according to the University of California, Davis. It's most well known in leopards, which live in Asia and Africa, and jaguars, inhabitants of South America. (Domestic cat lovers might be interested to know the agouti gene doesn't cause black fur in house cats.)

According to Big Cat Rescue, the colouring comes from a surplus of melanin, the same pigment responsible for suntans, and an animal with the condition is known as "melanistic."

Also, just because black panthers are dark in colour doesn't mean they don't have spots—they're just harder to see. (Also see "'Strawberry' Leopard Discovered—A First.")

"When their coat catches the sunlight in a certain way, you can see their spots very distinctly; at a bit of a distance, or if there is not direct sunlight on them, they look just like a solid black animal," said Patrick Thomas, general curator of the Wildlife Conservation Society's Bronx Zoo, which is home to two black leopards.

"Black leopards are more common in Asia than in Africa," Thomas said, "but I wouldn't say they were common anywhere."

Spotted Is the New Black?

Wouldn't a black coat be an advantage for nighttime hunters, and therefore more common? Actually, no, Thomas said.

"It's actually easier for other species to spot a solidly patterned animal versus one whose markings are broken up," he said.

"So a tiger with its stripes or a leopard, jaguar, or cheetah with its spots are more difficult to see in dappled vegetation than a solidly coloured animal would be." (See big cat pictures.)

Plus, Thomas says it's a misconception that big cats are strictly night owls.

"They're very opportunistic," he said. "If there's an opportunity to hunt during the day and they're hungry, they will."

Also, if "you're hunting when it's bright, there's an advantage to having your body broken up by a patterned coat rather than a solid coat."

Other wild cat species can have melanism—a 2012 study in PLOS ONE notes that it's been documented in 13 so far—but Thomas added he knows of no cases of lions or tigers with the condition.

Too bad ... if only because we're missing out on calling them blions and bligers. Oh my.

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