10 Fascinating Facts About the La Brea Tar Pits

There’s a gooey time capsule in the heart of Los Angeles, left over from an era when saber-toothed cats, dire wolves, camels, and giant sloths prowled Southern California. At the site known today as the La Brea Tar Pits and Museum, natural asphalt has bubbled up from below the ground’s surface since the Ice Age. This murky sludge has trapped and made fossils out of thousands of creatures, as small as bees and as big as mammoths. Here are a few of the amazing discoveries made there.

1. More than 3.5 million fossils have been discovered in the tar pits.
2. Paleontologists dig there most days of the year.
3. The only dinosaurs found at the La Brea Tar Pits are birds.
4. The tar preserved the fossils in pristine condition.
5. The pits contain entire ecosystems.
6. The tar pits were death traps—but still support life.
7. Only one human skeleton has been unearthed.
8. A police diver plunged into a tar pit to solve a cold case.
9. There are similar tar pits in other parts of the world.
10. Its name is redundant.

More than 3.5 million fossils have been discovered in the tar pits.

The tar pits have yielded one of the biggest collections of Ice Age fossils in the world, and collectively, the statistics are stunning. More than 600 species have been found, from snakes and mollusks to sloths and mountain lions. Of the mammals found at La Brea, around 90 percent are carnivores. (Amazingly, the pits have yielded more 200,000 individual dire wolf specimens alone.) The common explanation is that when big herbivores like mammoths got stuck in the asphalt, they would have looked like an easy meal to predators—who would then become stuck in the tar themselves.

Paleontologists dig there most days of the year.

The site is closed July 4, Thanksgiving, Christmas, New Year’s Day, and the first Tuesday of every month. The rest of the time, science is happening. The first excavations at the tar pits began in the early 20th century, and if you visit today, you’re still likely to see scientists preserving bones or digging in the asphalt. Still, people often don’t realize that it’s a place for active scientific research, as the tar pits lie in the middle of Los Angeles, a city synonymous with the entertainment industry. Emily Lindsey, assistant curator at the La Brea Tar Pits and Museum, told Mental Floss in 2017 that this has led to some confusion on the part of visitors, who “think sometimes the excavators are actors, or part of an art exhibit, or robots.”

The only dinosaurs found at the La Brea Tar Pits are birds.

After the paleontologists at La Brea have convinced you they aren’t robots, they’ll be quick to clear up another misconception: They don’t dig up dinosaurs. (Though, technically, they do. “We have 163 species of birds,” Lindsey said. Yes, birds are dinosaurs.) Most of the fossils at La Brea date from 11,000 to 50,000 years ago—about 65 million years after all other dinosaurs went extinct.

The tar preserved the fossils in pristine condition.

Sticky asphalt is a pain to clean off the bones, but it also keeps them in excellent condition. This means scientists can look at features as subtle as the markings on carnivore teeth. A 2014 study looked at microscopic patterns on the teeth of five species of big cats found at La Brea. The researchers concluded that the mountain lion was the only one to survive into the present because it wasn't a picky eater, and could survive changes in its food supply.

The pits contain entire ecosystems.

The big, extinct megafauna might soak up all the attention at La Brea, but paleontologists at the site have also recovered paper-thin fossils of pollen, bees, plant matter, insects, and other tiny organisms. “This is such a unique site because it’s one of the only paleontological sites in the world where you can get an entire ecosystem represented,” Lindsey said. “The big animals have pretty broad climate tolerances. Something like an insect has a much more narrow range.”

This is important because the presence of smaller organisms can relay more specific information about the ecosystem. And because La Brea has such a long record of fossils, scientists can track how those ecosystems changed—or didn’t—over time. For instance, one 2017 study of beetle fossils in the tar pits suggests that the climate of Southern California has been relatively stable over the past 50,000 years. Yes, LA has had great weather for a very long time.

The tar pits were death traps—but still support life.

In 2007, scientists discovered about 200 species of microorganisms living in the asphalt with no water, little to no oxygen, and a heavy dose of toxic chemicals. Some of these microbes represented families of bacterial species that had never been seen before. By studying extremophiles thriving in such hostile environments, scientists may learn more about how life might exist on other planets.

Only one human skeleton has been unearthed.

In 1914, researchers at the tar pits discovered a 9000-year-old set of human remains of a woman in her twenties, dubbed “La Brea Woman.” Though some had speculated that she had been trapped in the asphalt or that she was Los Angeles’s first homicide case, later studies suggested La Brea Woman’s remains had been ceremonially reburied in the asphalt, possibly with a domestic dog at her side. No other human remains have been found at La Brea. Historical accounts suggest that Indigenous peoples like the Chumash and Tongva used the asphalt from the tar pits as a glue or caulk for their wooden boats, so they must’ve tread carefully around the tar pits. But most of the fossils from the tar pits date from the period before humans populated the region. Researchers are investigating what was happening at the tar pits during the Holocene—the period that started after the end of the last Ice Age—which could reveal how the arrival of humans might have contributed to the extinction of big mammals.

A police diver plunged into a tar pit to solve a cold case.

In 2013, a police diver willingly went 17 feet under the surface of the sludge to hunt for weapons in a cold case homicide “I’ve been under moving ships, in underwater reservoir sheds,” LAPD Sergeant David Mascarenas told the Los Angeles Times. “This is by far the craziest thing I’ve ever done.” Despite the bad visibility, Mascarenas was apparently able to make out underwater pinnacles of tar, and he did recover multiple items of interest. He probably also succeeded in sending the LAPD’s message that it would “go as far as we can to make it as difficult for a suspect to discard evidence.”

There are similar tar pits in other parts of the world.

“There’s a couple of sites that have barely been studied but would probably be as rich as the La Brea tar pits,” Lindsey said. Venezuela has several tar pits, for instance, but because of the political situation, they haven’t been as intensely studied.

Its name is redundant.

La brea in Spanish means “the tar.” So when you say La Brea tar pits, you’re really saying the tar tar pits. It’s on the long list of tautological place names that also includes Lake Tahoe and the Sahara Desert.

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A version of this story was published in 2017; it has been updated for 2025.