About this episode

The episode discusses the Wallis Annenberg Wildlife Crossing, the largest wildlife crossing in the world, and its potential impact on California's mountain lion population.

When it opens in December, the Wallis Annenberg Wildlife Crossing will be the largest in the world. Stretched over a 10-lane freeway, it is intended to help save California's mountain lion population, which has become fragmented by the highway. It could also serve as a model for other projects, as crossings of this kind have often been viewed as too large to be effective. But will the crossing work? We examine the construction and the existing scientific data to find out. Image: Still picture from May 2026 drone footage of the Wallis Annenberg Wildlife Crossing under construction (Credit: Caltrans)

Topics covered

• wildlife conservation
• infrastructure
• environmental science
• animal crossings
• California
• mountain lions

Keywords

• wildlife crossing
• California
• mountain lions
• infrastructure
• environmental impact
• animal migration
• scientific data

Mentioned in this episode

Organizations: Wallis Annenberg Wildlife Crossing, Caltrans

Places: California, 10-lane freeway

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