Extracts from the Wikipedia entry for "facepalm" -
"A facepalm (sometimes also face-palm or face palm) is the physical gesture of placing one's hand flat across one's face or lowering one's face into one's hand or hands. The gesture is found in many cultures as a display of frustration, disappointment, embarrassment, shock, surprise or sarcasm.,,,,"
"This gesture is not unique to humans. A group of mandrills at the Colchester Zoo has adopted a similar gesture to signal the desire to avoid social interaction or to be left alone."
Colchester Zoo attracts many visitors from Essex.