Practice question

Monitoring vocal species across forests or oceans is difficult visually, especially nocturnal animals. Passive acoustic monitoring deploys autonomous recorders capturing soundscapes continuously for weeks, storing calls, songs, and echolocation. Spectrogram analysis identifies species presence, abundance, and behavior patterns without human presence disturbing wildlife. Camera traps capture images triggered by motion, GPS collars track movement, and line transects require observers walking. Acoustic sensors are non-invasive and operate day-night, suitable for birds, amphibians, bats, and whales, providing long-term data sets for biodiversity assessment.