Koko gets a nice back scratch from Dr. Penny Patterson. Back scratches are more than simply enjoyable. They can promote significant stress relaxation, and even gorillas (especially gorillas in captive settings) can benefit from that. Having developed a 36 year relationship with each other makes the relaxation benefits that much greater.
Everyone Benefits from Stress Relaxation
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Photographer: Ron Cohn
Source: 080724_S5_IMG_0362.jpg
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