Peacock Network (NBC)

NBC (originally the National Broadcasting Company) is sometimes called the "Peacock Network." The peacock symbolized the new color broadcasts and was introduced in the 1950s.

http://en.wikipedia.org/wiki/NBC
NBC, (Formerly an acronym for the National Broadcasting Company until 2004), is an American television and radio network based in New York City's Rockefeller Center. It is sometimes referred to as the Peacock Network due to its stylized peacock logo. The network is now part of the media conglomerate NBC Universal and supplies programming to more than 200 affiliated U.S. stations. NBC Universal is a unit of General Electric.

http://www.classicthemes.com/50sTVThemes/themePages/nbcLivingColor.html
N B C Living Color (Peacock Logo)
(Phrase used on NBC color shows from 1953;
Peacock still graphic logo used since 1956;
First animated Peacock logo appeared in 1957)
(...)
Introduction of the original "Living Color" Peacock logo on NBC
The Peacock graphic logo as a still image was first seen in July of 1956 (according to Chicago's NBC/5 Web Site.) According to NBC/5 sources, NBC commissioned New York designer Fred Knapp to create the graphic logo; obviously done in conjunction with the NBC Art Department under whose director of design at that time was John J. Graham. It took another 14 months for the Peacock to move its wings...in an animation executed by Elektra Film Labs of New York City.

This first animated version of the Peacock logo started in black & white and then "fanned" into color. It debuted on September 7, 1957 for a broadcast of "Your Hit Parade."

5 June 1957, Los Angeles Times, pg. A10:
I detected the fertile brain of Alan in the introduction of the stars when they appeared in the NBC color show peacock fan.

30 March 1958, Washington Post, pg. A8 ad:
"COLOR THE PEACOCK" Contest
WRC-TV Channel 4

16 April 1958, Washington Post, "Now Comes the Month Of the Big, Gaudy Bird" by Lawrence Laurent, pg. D11:
The star performer of this "Color Carnival" is the peacock, the gaudy bird that symbolizes that the rainbow has been added to television.
(...)
The children around town have entered the "Color the Peacock" contest, part of the month's emphasis on color TV. Now, NBC announces that its color TV programming schedule this fall will represent a 67 per cent increase over the start of last season.

22 May 1958, Washington Post, pg. C26:
It will mean, over a period of time, that the peacock which symbolized NBC color programs will be seen in Washington with increasing frequency.

24 November 1963, Los Angeles , pg. D2:
Earlier on turkey day, the peacock network (NBC) beams Macy's Thanksgiving Day Parade.