birds do not have a strong sense of hearing..explain
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Hearing is birds' second most important sense and their ears are funnel-shaped to focus sound. The ears are located slightly behind and below the eyes, and they are covered with soft feathers – the auriculars – for protection. The shape of a bird's head can also affect its hearing, such as owls, whose facial discs help direct sound toward their ears. The confusingly named ear tufts of many owls and other birds, however, have nothing to do with hearing.
Birds hear a smaller frequency range than humans, but they have much more acute sound recognition skills. Birds are especially sensitive to pitch, tone and rhythm changes and use those variations to recognize other individual birds, even in a noisy flock. Birds also use different sounds, songs and calls in different situations. Recognizing the different noises is essential to determine if a call is warning of a predator, advertising a territorial claim or offering to share food. Many birders study those calls and birding by ear can be useful for not only identifying birds but also understanding their behavior.
Some birds, most notably oilbirds, also use echolocation, just as bats do. These birds live in caves and use their rapid chirps and clicks to navigate through dark caves where even sensitive vision may not be useful enough to find their way.