The wee problem that attracts big, aggressive goats to Washington's Olympic Park

‘While the train is in the station, please refrain from urination’ school-boys chanted to the tune of Dvorák’s Humoresque, writes Richard Collins.

There is no such appeal to rail passengers nowadays but visitors to Olympic National Park, in Washington State, are asked not to pee near trails. Smells from hikers’ urine, sweaty clothes and backpacks attract aggressive goats. The animals were introduced to the park a century ago, but the place lacks natural salt deposits.