To trim a bird's nails, you would need a specialized nail trimmer designed for birds, such as a bird nail clipper. It is important to only trim the very tip of the nail to avoid cutting into the quick, which can cause bleeding and pain for the bird. It may be helpful to have someone assist you in holding the bird still while you carefully trim its nails. It is recommended to consult with a veterinarian or a professional bird groomer for guidance on how to safely trim a bird's nails.