Saturday, enjoy half-price admission and watch as the animals of Roger Williams Park Zoo receive new toys, such as balls, sensory-based stimuli and food puzzles. After about $200 worth of donations for the enrichment toys were stolen earlier this year, the zoo received an unprecedented $3,200 in from those who heard the news. In celebration, and as an expression of gratitude, Saturday’s visitors can watch as the new items are presented to the animals throughout the day.