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And on the fringe of the mountains, the area is home to bears, deer and rabbits.

According to the trust, thousands of years ago the glen would have been a native woodland but it was left bare by human intervention such as grazing sheep and deer.

It affects cattle, sheep, pigs and, according to the government, "other cloven-hoofed animals such as wild boar, deer, llamas and alpacas".

They jutted their hips in ways that seemed stilted, like baby deer learning to walk, while their arms hovered elegantly, undulating like swan wings.

The virus can spread through the urine, feces or saliva of wild rodents, including deer mice, which are common in many parts of California, according to the California Department of Public Health.