In Switzerland, conflicts between humans and wolves reached a peak in the 16th century, amid large-scale deforestation. Wolves became extinct in Zürich in 1684. They were later exterminated from Appenzell Ausserrhoden in 1695, and Schaffhausen in 1712. The last known traces of wolves in central Switzerland date back to 1707 in Zug, 1753 in Uri, and 1793 in Glarus. Wolves became extinct in Engadin in 1821. Between 1762 and 1842, 80 wolves were recorded to have been bountied in Vaud. Wolves were further exterminated in Valais in 1870, Ticino in 1872 and Solothurn in 1874. Wolves occasionally migrated to Switzerland in small numbers in the early 20th century. In 1908, a wolf was shot in Ticino, and a further two were killed in 1914 in Lignerolle.