The Rat Pack was a nickname given to a group of 1950s entertainers, which included Frank Sinatra, Dean Martin, Sammy Davis, Jr., Joey Bishop and Peter Lawford. The Rat Pack often performed in Las Vegas and were part of the reason that Las Vegas became such a popular entertainment destination.
Often, when one of the members was scheduled to give a performance, the rest of the Pack would show up for an impromptu show, causing much excitement and return visits. They sold out almost all of their appearances.
The term "rat pack" was assigned to the group by Lauren Bacall, after seeing them return from a night of partying. (The term rat is presumably meant in the sense of a dubious person or scoundrel). Shirley MacLaine was considered an honorary member of the Rat Pack and the only female to be considered "one of the boys."
According to rumor, the Rat Pack wasn't Bacall's, or even Sinatra's, idea. It had started with Humphrey Bogart, a pal of Sinatra's, who named a group of his drinking buddies the Holmby Hills Rat Pack.
They belong to a native family of rats and mice that have hair on their long tails, four toes on front feet and five toes on the hind feet.
Packrats love to collect and transport all kinds of things including pieces of paper and all types of shiny objects.
Packrats are persistent travelers spending their nights scurrying about on limbs of shrubs or taking exploratory excursions over trails they have previously established.