The only bird known to make use of infrasound (at about 20 Hz) is the western capercaillie. The hearing range of birds is from below 50 Hz (infrasound) to around 12 kHz, with maximum sensitivity between 1 and 5 kHz. The range of frequencies at which birds call in an environment varies with the quality of habitat and the ambient sounds.
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How much carpet cleaning should cost. Average costs and comments from CostHelper's team of professional journalists and community of users. Chemical cleaning a 900-square foot two-bedroom apartment with about 650-square feet of carpet between the bedrooms, hallway and living room runs $124-$240. 1  A 1,300-square foot single-story home has about 975-square feet of carpet through three bedrooms, living room and hall and costs $186-$390.