A dozen wildfire-mitigation goats and sheep mysteriously died on the job in the North Bay, but why?

STINSON BEACH, Calif. - Herds of goats are often used to graze on dry brush to help prevent wildfires in the Bay Area. But a shepherd in the North Bay has been left reeling after more than 10% of her herd mysteriously died while on the job.

Bay Area woman raises goats and sheep to help prevent wildfires

For 10 years, Billie Thibodeau, owner of Scape Goat Grazing, has been raising goats and sheep.

"Every single member of my herd has a name," said Thibodeau.

Homeowners and landlords hire the animals to eat dry brush to reduce the risk of wildfires.

"We're helping communities stay fire safe and in a natural way," said Thibodeau.

A mysterious illness

Thibodeau says her animals have always been in good health – until about two weeks ago, when they were grazing on a property in Stinson