Antennae are sensory appendages found on the heads of many animals, particularly insects and crustaceans. They serve various functions, including detecting chemicals, vibrations, and movement in the environment. Antennae can vary in size, shape, and number, depending on the species. In insects, antennae are often long and segmented, allowing for enhanced sensory perception. They play a crucial role in communication, navigation, and finding food. In crustaceans, such as crabs and lobsters, antennae can be more robust and are used for both sensing the environment and balancing.