California's $114M Wildlife Crossing to Monitor Animal Emotions

Researchers are employing advanced tracking technology to assess animal welfare at a costly new wildlife crossing in Southern California. The Wallis Annenberg Wildlife Crossing, slated to open over the 101 Freeway in Agoura Hills in December, will feature "biologging tags" on animals to measure physiological data such as heart rate and body temperature, offering insights into their emotional states as they use the structure.

The $114 million project aims to reconnect fragmented wildlife populations, particularly mountain lions and bears, that have been isolated by the busy freeway. Officials detailed the technology at a recent press conference, explaining that the tags will provide crucial data on how animals interact with the crossing.

"We’ll be able to see not just how the animals move near the crossing, but how they are physiologically affected," said Seth Riley, chief wildlife ecologist for the Santa Monica Mountains National Recreation Area. "Are they happy to go up on there and their heart rate doesn’t change, or what is it like to be near the freeway? That will be a new kind of data that we’re interested in."

Scientists have already begun fitting deer with the tracking collars, with plans to outfit mountain lions next. This initiative is a key component of conservation efforts for species like the mountain lion, whose population in the Santa Monica Mountains has been severely impacted by habitat fragmentation.

The impetus for the crossing was partly inspired by the death of P22, a famous mountain lion known as the "Hollywood Lion," who died after being struck by a vehicle while attempting to cross the 101 Freeway. The crossing is intended to prevent similar incidents and ensure the long-term survival of local wildlife.

The bridge itself measures 210 feet long and 174 feet wide, with a concrete base. Construction began after Governor Gavin Newsom broke ground in 2022, with an initial state commitment of $54 million. However, the project's cost has escalated significantly, reaching $92 million by 2025 and potentially soaring to $114 million. Taxpayer contributions currently stand at $77 million, supplemented by philanthropic funding.