U.S. Forest Service stock animals are indispensable to trail work on public lands in the West. Trump’s radical upheaval is accelerating the death of a dying art.

Dressed head to toe in a white designer ensemble as she headed to the Commonwealth Day service alongside senior royals last month, Geri Horner looked almost unrecognisable.

After a four-year absence for renovations, during which the collection was transported to the brutalist Breuer building on ...