Fig. 2
From: High-frequency and high-amplitude sounds enhance bird deterrence
Acoustic spectrograms of experiment sound types. A1.200 Hz - Constant; A2.6400 Hz - Constant; A3.12800 Hz - Constant; B1.200–6400 Hz - Alternating; B2.6400–12,800 Hz - Alternating; B3.200–12,800 Hz - Alternating; C1.200–6400 Hz - Rapid Sweep; C2.6400–12,800 Hz - Rapid Sweep; C3.200–12,800 Hz - Rapid Sweep; D1.200–6400 Hz - Stepped Frequency; D2.6400–12,800 Hz - Stepped Frequency; D3.200–12,800 Hz - Stepped Frequency.
