Employees at the Shedd Aquarium announced plans to unionize Thursday, the latest in a series of unionization campaigns at Chicago’s prominent cultural institutions in recent years. In a public letter, 60 people — or about 20% of union-eligible employees at the aquarium — said they’ve faced work-life imbalance, high staff turnover, financial struggles and a lack of communication from management, with “little tangible response.” They said these issues have led to burnout, low morale and decreased animal welfare. “Together in our union, we can bring to light and work to resolve these inequities in order to better our own lives and — very importantly — those of the animals we work to protect and uplift,” the letter said. The employees eventually plan to file for a union election with the American Federation of State, County and Municipal Employees Council 31, which since 2022 has unionized workers at the Museum of Contemporary Art, the Art Institute and its affiliated school, the Museum of Science and Industry, the Field Museum, the Peggy Notebaert Nature Museum in Lincoln Park and the Newberry Library, a research library on the Near North Side.