Large ears serve multiple functions: especially large ears are often meant to help release heat in desert-dwelling species. While it’s true that big ears can be excellent hearing aids, catching and channeling sounds toward the inner ear like satellite dishes, they are not the only indication of hearing ability. For example, most owls have extraordinary hearing, but no external ears whatsoever. The shape of their faces actually directs the sound instead of ears. Whales also have perfectly good hearing but no external ears: their hearing is developed for underwater listening. So while big ears can be connected to acute hearing, they are far from a sure indicator of hearing ability.
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