Their ears, of course.
They use their eyes
Llamas have well-developed senses that help them navigate their environment. They possess excellent eyesight, allowing them to see a wide range of colors and detect movement from afar. Their sense of hearing is also acute, enabling them to pick up sounds that humans might miss. Additionally, llamas have a good sense of smell, which they use to identify threats and communicate with other llamas.
no
People can use the fur, the meat and the milk. Llamas can also be used as pack animals.
Llamas
You use "te llamas" when asking someone's name directly, like "¿Cómo te llamas?" meaning "What's your name?" You use "se llama" when referring to someone else's name, like "Él se llama Roberto" meaning "His name is Roberto."
They Use their knees and instincts
by llamas
No, because the use now would be the use then which is not really vestigial.
One structure that does both of these is called the LATERAL LINE.
Llamas, alpacas.
Most important appendage which Arthropods use for sensing environment is antenna .Antenna is head appendage used to sense sound chemicals heat etc.