Final answer:
Psittacine species are known for their loud vocalizations, necessitating the use of ear protection when restraining them to prevent hearing damage.
Step-by-step explanation:
Ear protection should be worn when restraining psittacine species (A. Psittacine), which include parrots, parakeets, and related birds. These birds can produce extremely loud vocalizations that may damage hearing. Psittacines originated from regions such as Africa, Asia, and Australasia, and research has shown the importance of various protection measures to ensure their nesting success. For example, protective measures like ear protection are also essential for handlers to safeguard their hearing while interacting with these loud birds.