Antenna (biology)
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Antennae, sometimes referred to as "feelers", are paired appendages used for sensing in arthropods.
Large antennae on a longhorn beetle
A spiny lobster, showing the enlarged second antennae
The large flattened plates in front of the eyes of a slipper lobster are the modified second antennae.
The crab Cancer pagurus, showing its reduced antennae
Appendage
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An appendage is an external body part, or natural prolongation, that protrudes from an organism's or microorganism's body.
A beetle leg