The Como Park Zoo reached a milestone in its 10-year expansion plan with the opening of a new $2.8-million wing at its Conservatory this weekend, and more change is coming. Up next for the 100-year-old zoo is Gorilla Forest. Its grand opening is scheduled for June 6th. The $11-million state-funded project will roughly triple the space for the zoo’s giant apes, and features ponds and waterfalls for a gorilla population that has grown to seven. Zoo officials say seven out of 10 Como visitors come at least partly because the zoo is free. In 2010 Como had 2.2-million visitors, the most for any cultural institution in Minnesota. More than three-fourths of those visitors were people who lived outside St. Paul.