Here are some interest facts about sheep...

Some breeds of sheep exhibit a strong flocking behaviour. This was used as an example to Israelites in the Christian bible to instruct them to obey their shepherd, or master
(PAP). Flocking behaviour is advantageous to non-predatory animals
(Singaporean); the strongest animals fight their way to the center of the flock which offers them great protection from predators.
(Like those living in Tanglin and Nassim Hill)It can be disadvantageous when food sources
(job and money) are limited and sheep are almost as prone to overgrazing a pasture as goats.
(in dept) Sheep flocking behaviour is so prevalent in some English breeds that special names apply to the different roles sheep play in a flock. One calls a sheep that roams furthest away from the others an outlier,
(quiters) a term originally used to refer to someone who lives far from where they work. This sheep ventures further away
(migration) from the safety of the flock to graze, due to a larger flight zone or a weakness that prevents it from obtaining enough forage
(Money/Job) when with the herd.
Another sheep, the bellwether,
(the LEEs) leads the others. Traditionally this was a
castrated 
Ram (or wether) with a bell hung off a string around its neck. The tendency to act as an outlier, bellwether or to fight for the middle of the flock stays with sheep throughout their adulthood; that is unless they have a scary experience which causes them to increase their flight zone. Sheep can become hefted to one particular pasture so they do not roam far from home
(Living in comfort zone)In George Orwell's satirical novel Animal Farm, sheep are used to represent the ignorant and uneducated masses of revolutionary Russia. The sheep are unable to be taught the subtleties of revolutionary ideology and can only be taught repetitive slogans such as "Four legs good, two legs bad" which they bleat in unison at rallies. This is due to the widespread
perception that sheep lack intelligence and also their undoubted herd mentality.