Palps, also known as "palpi", are the delicate appendages attached to the head of an insect or arachnid. Palps are connected to the mouth and are used to manipulate food, explore the environment, and for mating. Synonyms for "palps" include "maxillipeds", "antennules", "tarsi", "feeler", "tentacle", "whiskers" and "mouthparts". Maxillipeds are found in crustaceans, while antennules are found in crustaceans and some insects. Tarsi are the last segment of an insect's leg that can sometimes be used for feeling, while tentacles are long and flexible like palps. Whiskers refer to the feelers of small mammals, and mouthparts include all structures in an insect's mouth.