News story about Cinders the pig:
“You can’t get much happier than a pig in muck, or so we are told. But when this little piggy arrived in the farmyard she showed a marked reluctance to get her trotters dirty.
“While her six brothers and sisters messed around in the mire, she stayed on the edge [...]

Excerpts from article Oxytocin and Social Phobia :
Social phobia or social anxiety disorder is characterized by extreme and persistent anxiety associated with social or performance situations.
Scientists believe that the amygdala is responsible for the symptoms of social phobia as it is the central site in the brain that controls fear responses and produces the symptoms [...]