The No. 1 overall draft pick in 2009 and NL All-Star in 2012 wound up dropping his fifth consecutive decision of 2013, slumping his shoulders and bowing his head while laboring through a 42-pitch fifth inning during an 8-2 loss to the Cubs.

NPR: Strasburg Drops To 1-5 As Cubs Beat Nationals 8-2

African great apes such as bonobos (Pan paniscus) and chimpanzees (Pan troglodytes) are known to use head gestures such as nodding, bowing and shaking to communicate with other group members.

BBC: Earth News - Bonobo chimps filmed shaking their head to 'say no'

The Dutch commander, Justin of Nassau, bowing as he proffers the key to the city, raises his head, surprised, to meet the eyes of Spinola, who touches him on the shoulder with one hand while dangling a mace of command in the other.

NEWYORKER: The Reign In Spain