In 1987, a new master plan was formulated to dramatically expand the zoo. Over time, many new exhibits were built, including a new sea lion exhibit (1987), a Humboldt penguin exhibit (1988), "Plains of Africa" (1991–93), "Madagascar" (1995), and "Marco Polo Trail" (1996). In 1989, the old Menagerie building was once again renovated, this time into a new gift shop. A new veterinary hospital opened in the spring of 2011. "Hasbro's Our Big Backyard" opened in 2012 as an interactive play space, with a second phase completed in 2014 featuring native New England animals. In the summer of 2012, the zoo opened new exhibits for takins, red river hogs, and king vultures.