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"One of nature's uglier creatures, the bat is a misunderstood marvel of evolution. Producing a series of loud, high-pitched squeaks, the bat can judge an insect's distance and elevation by the time delay of the squeak's echo! Changes in the echo's pitch reveal the doomed bug's direction! No movement escapes the incredible senses of the bat! Glump! Ta-daa! Eyes closed! Calvin, sit up and eat with a fork like a civilized human being. The bat is a marvel of evolution. Producing high-pitched squeaks, the bat can judge an insect's distance and elevation by the delay in the sound's echo. No movement escapes the senses of the bat. Calvin flips some food into his mouth from the restaurant table. His eyes are closed. Dad scolds Calvin to sit up and eat with a fork like a civilized being."