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The arrector pilli does not cause shivering - it's responsible for "goosebumps".. shivering is caused by skeletal-muscles..
Shivering is an involuntary muscular response from the body, triggered by cold. The "shivering" muscles are trying to internally generate heat, to help keep you warm.
When the human body becomes cold shivering begins. Also, goosebumps develop in an attempt to keep heat in the body.
Keep warm, and try not to become frightened.
People get goosebumps when they're cold, or thrilled. Goosebumps are caused by tiny muscles, controlled by nerves to keep you warm.
Not very effectively. Shivering is a last-ditch attempt by the body to generate heat in it's own muscles to try and ward off increasing cold, but the operative words are "last ditch" - it just doesn't help much if one is really chilled.
Stay Warm
Shivering to produce heat, goosebumps, blood capillaries narrowing.
If it is a wild bird, it may be shivering due to too much stimulation. Call and find someone experienced in fostering young animals.
Because shivering is just all your muscles working (in order to get warm)
Shivering