New Ice Age toad species discovered at La Brea Tar Pits offers climate insights

Beneath the asphalt and urban sprawl of Los Angeles lies one of North America's most productive fossil sites, a place where tar has been seeping from the earth for tens of thousands of years, trapping and preserving the remains of creatures that walked this landscape during the last Ice Age. Now, paleontologists working at La Brea Tar Pits have identified a species that was previously unknown to science: a small spadefoot toad they have named Spea labreae, a discovery that adds another piece to the puzzle of what the Los Angeles basin looked like when megafauna roamed and the climate was dramatically different from today.

The find is significant not because the toad itself was a dominant force in its ecosystem—it was a small amphibian, after all—but because what it tells us about the world it inhabited. Spadefoot toads are creatures of specific environmental conditions. They require certain moisture levels, certain soil types, certain patterns of rainfall and drought. The presence of Spea labreae in the tar pits, preserved alongside the bones of dire wolves, saber-toothed cats, and ground sloths, suggests that the Ice Age Los Angeles basin supported ecological conditions quite different from what we might assume. The toad's existence there is a kind of biological marker, a signal about temperature, precipitation, and the overall character of the landscape.

La Brea has been yielding fossils for more than a century. The tar itself acts as a natural trap—animals came to drink or hunt, became stuck, and were preserved in the sticky matrix, their bones accumulating in layers that tell the story of thousands of years of life and death. But for all the mammoths and saber-tooths that have been catalogued, the smaller creatures—the amphibians, the insects, the birds—have received less attention. This new toad species represents a shift in how paleontologists are reading the site, looking beyond the charismatic megafauna to understand the full texture of ancient ecosystems.

The discovery of Spea labreae expands the known diversity of amphibians from the Ice Age Los Angeles region. It suggests that the tar pits were not simply a death trap for large predators and their prey, but a window into a complete world—one that included small, moisture-dependent creatures living alongside the giants. The toad's presence implies that the region had adequate water sources, that there were seasonal patterns of wet and dry, that the overall climate supported a different mix of species than exists in Los Angeles today.

For paleontologists, this kind of discovery is valuable precisely because it is unexpected. The oddball specimens, the creatures that don't fit neatly into the narrative of Ice Age megafauna, often reveal the most about how ancient environments actually functioned. A spadefoot toad cannot tell us about predator-prey dynamics the way a saber-tooth can, but it can tell us about moisture, about soil conditions, about the background ecology that made life possible for everything else. As researchers continue to analyze the fossils from La Brea, specimens like Spea labreae may force a reconsideration of what the prehistoric Los Angeles basin was really like—not just a hunting ground for apex predators, but a functioning ecosystem with its own particular climate signature, written in the bones of creatures both large and small.