About 12,000 people visited the Oklahoma City Zoo for free Friday in celebration of a city sales tax that funds major projects at the zoo. The sales tax appreciation day is always a draw for visitors, zoo spokeswoman Tara Henson said. But this year the day was especially popular because of a break in triple-digit temperatures and because the tax anniversary fell on a Friday. Voters passed the 1/8-cent sales tax July 17, 1990. The dedicated tax has paid for such projects as Great EscApe, Cat Forest/Lion Overlook and Oklahoma Trails. The new Children’s Zoo, which is scheduled to open next year, is also funded by the tax. Besides sales tax appreciation day, the zoo offers other admission specials throughout the year. Admission is 75 cents on Wednesdays in July and August. Admission is free on Mondays in December, January and February.