Life lessons from the Northern White-Cheeked Gibbon: If your friend appears sad and you’re not sure what to do, scream in their ear as loudly as you can. The shock will distract them from their sadness.

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These two fantastic creatures were photographed at Melbourne Zoo. A classic case of sexual dimorphism, the white female and black male gibbon are mother nature’s answer to Ebony and Ivory. These beautiful primates are critically endangered, with less than 1,000 estimated to still be remaining in the wild.

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Northern white-cheeked gibbons (Nomascus leucogenys), Melbourne Zoo, Australia