the zoo's area expanded by a third, and new exhibits featuring bison, elk, and prairie dogs were added. in 1976, in honor of the american bicentennial celebration, the park's grizzly bear facility was expanded. in 1978, the park zoo trust fund (distinct from the zoo admissions trust fund) was established to make sure a portion of concession sales were used to improve the zoo. this freed the zoo from having to approve a budget with the city council. in 1979, the zoo added the edward a. kane reptile house, the world's first computer-controlled reptile habitat.