Wolf Entertainment

Background
Wolf Entertainment is the production company of Dick Wolf, best known as the creator of the Law & Order franchise. In addition to L&O, the company is responsible for the Chicago (a.k.a. One Chicago) and FBI (a.k.a. The FBIs) franchises, among other shows created by Wolf. The company was founded in 1988. Until 2019, it was known as "Wolf Films".

Logo (September 21, 1989-)
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Visuals: There is a silhouette of a wolf in the distance howling at the moon (represented by a white sphere) while standing on a dark, black ground against a dark red sky background with few stars over it. On the screen, we see the text:

Serif

Serif

The text appears to be in Friz Quadrata (a font used in some form in most of Dick Wolf's productions, most famously the Law & Order franchise; the font is also used in the end credits of DreamWorks Animation, the logos of the original six Fox stations, and even some other production company logos).

Variants:
 * The color of the sky may vary.
 * In the early version of this logo, the sky looks like a night sky.
 * Starting in 1990, the sky is more like a sunset.
 * There could also be a mixture of a sunset turning into a night sky.
 * Two versions for high-definition shows exist:
 * The first one is basically the original version of the logo in 16x9. This was used from 1999 to 2011.
 * The second version is a enhanced version of the logo. This was introduced in 2011.
 * An earlier animated version exists on earlier Wolf productions like Christine Cromwell and Nasty Boys. There is the text starting from black, but starting from a purple night sky, the moon is rising, and the wolf is animated, howling to the screen. The text then later turns, and the sky also turns to a normal night sky.
 * The height of the hill may vary.
 * On the Mann & Machine episode "Truth or Consequences" and the season 3 Law & Order episode "Jurisdiction", the moon is seen rising to its spot.
 * On Law & Order: UK, the Wolf Films logo is seen on the lower left with the NBC Universal Television Studio logo on the right and the Kudos Film & Television logo with the Shine Group byline below above the Wolf/NUTS logos with the letter "A" above the Kudos logo and the word "Production" below the logos. On series 7, it's the current Kudos logo with the Shine Group byline below the Kudos logo. Except below the Wolf/NUTS logo, the word "For" is also seen below followed by the 2013 ITV logo below.
 * On the short-lived reality show Stars Earn Stripes, "F I L M S" is replaced by "R E A L I T Y LLC".

Technique: None. A mix of live-action and early computer animation for the earlier animated variant.

Audio: A soundbite of a wolf howling and crickets chirping.

Audio Variants:
 * Sometimes, the closing theme of the show plays over it.
 * For the earlier animated variant, we hear more crickets chirping sounds, as well as an owl hooting.
 * NBC and CBS play their own generic music over the logo instead, both having done so since 1994, as well as ABC since 1998.

Availability: It appeared on all of Dick Wolf's productions for almost 30 years.
 * Currently, it's mainly seen on all of the pre-2019 series in the Law & Order franchise, which consists of the original Law & Order (original run only; the revival uses the 2nd Wolf Entertainment logo), its made-for-TV movie Exiled: A Law & Order Movie, its spin-offs Special Victims Unit (until season 20), Criminal Intent, Trial by Jury, Los Angeles and True Crime, and the foreign adaptation Law & Order: UK.
 * Other Dick Wolf series featuring this logo includes the Chicago franchise which also consists of Chicago Fire (until season 7), Chicago P.D. (until season 6), Chicago Med (until season 4) and Chicago Justice.
 * It was also seen on other shows that Wolf created such as Nasty Boys, Players, 3AM, New York Undercover, The Wright Verdicts, Mann & Machine, the short-lived reality series Arrest & Trial, the 2003 revival of Dragnet, the failed pilot of Lost & Found, the 1993 TV series Crime & Punishment, and the first season of FBI on CBS.
 * It was also surprisingly seen on Prosecuting Evil with Kelly Siegler.

1st Logo (April 7-September 10, 2019)
Visuals: Same as the previous logo, but with a few changes: as the logo fades in, we see the familiar setting in a more realistic fashion, with the added nebula, the detailed moon, now in between the text and the wolf, and being slightly less saturated as a result. The text is also smaller, with "E N T E R T A I N M E N T" in place of "F I L M S" and in a different font, which is now animated, fading and slightly zooming in after the first second before it stops moving a second later. The wolf is no longer between the "Serif" and "Serif" of "Serif" and is now at the far right of the logo, and is also animated, now howling throughout the logo.

Variant: On First Responders Live, the logo moves differently. Here the text wipes in, while the wolf is howling.

Technique: A mix of live-action and CGI.

Audio: Same as before.

Audio Variants:
 * The howl is slightly different on First Responders Live.
 * Fox airings of the aforementioned show also used a generic theme.

Availability: Seen on the Oxygen original series Murder for Hire, and First Responders Live on Fox.

2nd Logo (September 24, 2019-)
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Visuals: On a night sky, we see the moon, with a silhouette of a wolf howling in a distance, animating (similar to the early variant of the Wolf Films logo). On the screen we see the text "Serif" with "ENTERTAINMENT" down below, colored black. The moon rises, and the text turns (also similar to the early variant of the Wolf Films logo). The background then turns black, leaving only the moon and the text.

Trivia: This logo was designed by Chermayeff & Geismar & Haviv of New York, a firm also responsible for the six-feathered NBC Peacock, the 1984 PBS logo, the Viacom "Wigga Wigga" logo, the 1965 Screen Gems Television logo, the 2014 RatPac Entertainment logo, the Warner Bros. Discovery logo, among other designs.

Variant: Starting with season 4 of FBI, season 3 of FBI: Most Wanted and season 1 of FBI: International , the moon and the wolf are in different positions.

Technique: A mix of live-action and 2D computer animation.

Audio: Same as the first two logos, but slightly different.

Audio Variant: NBC and CBS airings use their generic themes.

Availability:
 * First seen on the second season of FBI on CBS, then appeared on the fifth season of Chicago Med, the eighth season of Chicago Fire, the seventh season of Chicago P.D. and the 21st season of Law & Order: SVU on NBC.
 * It is also seen on new shows that Dick Wolf created like FBI: Most Wanted, Law & Order: Organised Crime and FBI International, as well as the original Law & Order when it was revived, and the CNBC series Blood & Money.