This early 20th-century book documents European settlers' impact on the native ecology of New Zealand. William Herbert Guthrie-Smith owned a 24,000-acre estate on which he raised sheep for commercial wool production. Over the course of several decades, Guthrie-Smith observed the changing landscape, and particularly how introduced plants and animals altered New Zealand's native ecology. Published in 1921, Tutira documented the long history of human impact on New Zealand's environment, from the early Maori to European settlement.