. Echoes of bats and men . Fig. 5. A whirligig beetle whose other legs lie beneath its body is able to sense water waves and their echoes with the two specialized antennae which protrude from the head and float on the water. It is also interesting to note that this beetle has four compound eyes, two above the water and two below. Studied these beetles with great care in the 1920s. Un- like those of most insects, their antennae, or feelers are shaped in an especially suitable way to float on the sur- face film of the water. The numerous hairs all arranged 54

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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectorientation