ZIP Codes are a system of postal codes used by the United States Postal Service (USPS) since 1963. The term ZIP, an acronym for Zone Improvement Plan, was chosen to suggest that the mail travels more efficiently, and therefore more quickly (zipping along), when senders use the code in the postal address. The basic format consists of five numerical digits. An extended ZIP+4 code, introduced in 1983, includes the five digits of the ZIP Code, a hyphen, and four additional digits that determine a more specific location within a given ZIP Code.
The Pink River Dolphins of the Amazon River in South America are  pink-colored because they have a lot of blood vessels near the  surface of their skin, so that they can betâ¦ter control their body  temperature.    The pink river dolphin of the Amazon River is rare.
Of the five freshwater species of dolphins in the world, the pink Amazon River dolphin also known as botos, are considered to be the most intelligent. These friendly, sensitive, mammals have a brain capacity 40% larger than that of humans.