Why do some animals hear sounds we can't?
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Answer: Ears detect different frequencies
Ears detect different frequencies ✓ — Correct! Different species have different hearing ranges based on ear structure and cochlea design. Humans hear roughly 20 Hz to 20 kHz. Dogs hear up to 45 kHz (detecting high-pitched dog whistles). Bats hear up to 120 kHz for echolocation. Elephants hear down to 14 Hz (infrasound for long-distance communication). Each species evolved hearing suited to survival needs.
Their brains are more powerful — Wrong. Hearing different frequencies isn't about brain power—it's about cochlear (inner ear) physical structure. The cochlea is like a piano—different positions resonate at different frequencies. Humans' cochlea is tuned to 20 Hz-20 kHz. Dogs' cochleas include higher-frequency resonances. Brain processing differs too, but the frequency limitation is primarily in ear hardware, not brain power.
They listen more carefully than us — Wrong. Attention and focus can't overcome physical ear limitations. Human cochleas simply cannot vibrate at frequencies above ~20 kHz or below ~20 Hz regardless of focus. A dog whistle (25 kHz) is physically inaudible to humans because our cochlear structures don't resonate at that frequency—no amount of careful listening can detect frequencies outside our ear's physical capabilities.