The company spent two years developing a fire-shooting device for the revamped volcano. It closed in February 2008, to allow for the $25 million upgrade to take place. The volcanic structure, made of steel, was stripped down to receive a new exterior. It reopened at the end of the year. The improved volcano shoots water 12 feet high, while 120 flamethrower devices spout out flames on the lagoon. The attraction is choreographed to music by Mickey Hart and Zakir Hussain. WET's redesign was inspired by the Fountains of Bellagio, another choreographed attraction by the company. In 2015, MGM reduced the number of daily volcanic eruptions as a potential cost-saving measure. Animal habitats A $14 million dolphin habitat opened at the Mirage on October 19, 1990, serving as an educational and research center. The habitat consists of four pools providing a total of 2.5 million gallons, exceeding government regulations. The facility includes tours, and visitors can interact with the dolphins and become trainers for a day. It is a popular educational attraction among schoolchildren. It originally featured five bottlenose dolphins, including four from Marathon, Florida and one from Texas. As of 2008, three dolphin generations had been born at the attraction, and a fourth began in 2019. The attraction does not feature wild dolphins. On November 13, 1996, the Mirage opened the Secret Garden of Siegfried & Roy, an outdoor attraction showcasing six types of animals which were featured in the magicians' show at the resort. These included Bengal tigers, white tigers, white lions, a snow leopard, a panther, and an Asian elephant. Siegfried & Roy also ran a breeding program for big cats, particularly white lions and tigers, which resided at the Secret Garden. The $15 million attraction, covering , was built next to the property's dolphin habitat. By 2002, the dolphin area had become part of Siegfried & Roy's attraction, now known as Siegfried & Roy's Secret Garden and Dolphin Habitat. The attraction covers 10 acres, and received 500,000 annual visitors as of 2017. In addition, the white tigers from Siegfried & Roy's magic show were on display for free while not performing. A first-floor hallway near the resort's southern entrance featured a glass wall, allowing guests to watch the tigers in an enclosure. The tiger habitat was designed in all-white by Brinkerhoff, and was built for approximately $5 million. It opened with the resort in 1989, and was