Fuleco - Official Mascot of 2014 FIFA World Cup in Brazil.

Fuleco is the Official Mascot of the 2014 FIFA World Cup in Brazil. He was chosen by over 1.7 million people in Brazil after three-months voting process that was derided by fans as undemocratic. "Fuleco" is a fusion of the words “futebol” (football) and “ecologia” (ecology), and FIFA said the choice showed that Brazilians cared for the environment just as much as for football.

"Fuleco" is an armadillo (placental mammals with a leathery armor shell), which is in danger of extinction, rolls up into the shape of a ball when threatened. The mascot carries the colors of the Brazilian flag - the armadillo is yellow, with green shorts and a blue shell and tail. It is dressed in a white shirt with the words "Brazil 2014" written on it. He also carried a ball called the “Adidas Brazuca” the Official Match Ball for the 2014 FIFA World Cup.

Vučko - Mascot of the 1984 Winter Olympics in Sarajevo (Yugoslavia)

Vučko the little wolf was the official mascot of the 1984 Winter Olympics in Sarajevo (Yugoslavia) present Bosnia-Herzegovina. The XIV Olympic Winter Games, was a winter multi-sport event which was celebrated from 8–19 February 1984. Vučko the tough and courageous wolf was voted from a choice of six candidates by the readers of three popular Yugoslavian newspapers.
This mascot helped to change the traditionally frightening and bloodthirsty image of the wolf, which is present in the region. According to the designer, the little wolf symbolized the human desire “to be friend animals and become closer to nature”. This wolf has both a serious and a cheerful side, but is happy rather than serious. It symbolizes the desire of human beings to make friends with animals, to make a wolf into a Vuchko.

Bill the Goat - The U.S. Naval Academy Mascot

Bill the Goat is The Naval Academy Mascot. The U.S. Navy has had a goat as its mascot since 1890 when, according to legend, on their march from the ferry station at Highland Falls up the steep hill to West Point to play the first Army-Navy football game, the Naval Cadets (as they were then known) saw a goat outside the NonCom's houses at West Point and promptly commandeered "Billy" for their mascot. Since that time the goat has remained as the recognized mascot of the U.S. Naval Academy.

Rowdy the Roadrunner - Mascot of the University of Texas

Rowdy is the mascot of the University of Texas at San Antonio (UTSA) in USA. He is an animal mascot anthropomorphic bird called roadrunner, a fast-running bird that has a long tail and a crest and also called a chaparral bird and a chaparral cock.
He was chosen as the official mascot of UTSA in 1977 defeating the armadillo in a student election for the University mascot. His appearing as a supporter of athletics and other university sponsored events for the UTSA. 

Fin - Mascot of The Vancouver Canucks (NHL)

Fin the Whale (Fin Orca) is the mascot of the NHL team the Vancouver Canucks, the National Hockey League team based in Vancouver, British Columbia, Canada. He is an animal mascot anthropomorphic killer whale (orca). He was born on June 4, 2001 in Canada's West Coast. He is a 6’3” mascot, plays the position of a goalkeeper and one of the newest members to the NHL’s mascot family.
Fin is usually hanging around the Canucks, proudly beating his drum at every Canucks hockey game. His trademark move consists of steam emitting from his blowhole and his "chomping" of unsuspecting heads at Rogers Arena.

Moondog - Mascot of NBA's Cleveland Cavaliers (the Cavs)

Moondog is the official mascot of National Basketball Association's Cleveland Cavaliers. Cleveland Cavaliers (also known as the Cavs) is a professional basketball team based in Cleveland, Ohio. Moondog is an animal mascot anthropomorphized dog. His first appearance for the Cavs was on November 5, 2003. His former mascot for the Cavs was Whammer a polar bear.
(source: http://en.wikipedia.org)