In his popular book that describes his eleven years of travels in the Amazon, “The Naturalist on the River Amazons,” published in 1863, Henry Walter Bates paints a vivid picture of the sights and sounds of the rainforest. He was clearly affected by the calls of the howler monkeys — he called them howling monkeys. “Morning and evening the howling monkeys make a most fearful and harrowing noise, under which it is difficult to keep up one’s buoyancy of spirit. The feeling of inhospitable wildness which the forest is calculated to inspire, is increased tenfold under this fearful uproar.” In another part of the book he described how “Two flocks of howling monkeys, one close to our canoe, the other about a furlong distant, filled the echoing forests with their dismal roaring.” During his extraordinary 11-year sojourn in the Amazon rainforest from 1848 to 1859, Bates collected over 8,000 specimens new to science, including 100 new species of butterflies and beetles, and his observations on mimicry was hailed by Charles Darwin as evidence for natural selection in action.
For more on the science adventure story of Henry Walter Bates watch the IMAX film Amazon Adventure