antenna
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An antenna is a long, thin appendage that arthropods (insects, crustaceans, and similar creatures) use to sense their environment, detecting things like smell, touch, and air currents. These sensory organs are crucial for how arthropods navigate, find food, and interact with the world around them.
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Large antennae on a longhorn beetle
An antenna (plural: antennae) is one of a pair of appendages used for sensing in arthropods. Antennae are sometimes referred to as feelers.