Recordar um tema célebre...

(…)

“In my opinion, a cultural behavior has at least three important aspects: emergence, propagation, and modification. The sweet-potato washing showed these three aspects successfully. First, emergence — it was the monkey nicknamed “Imo” who first started doing this behavior. It seemed to represent her original innovation. No monkeys in the preceding years had performed this behavior. The second is propagation; the new behavior spread through the Koshima troop along two different channels, kinship relations and playmates. Imo’s mother and siblings followed her in washing potatoes. The young monkeys a year older than Imo and a year younger than Imo also adopted her practice.” 

(...)

Aqui: para consultar com música em fundo.