The Ecotarium in Worcester will re-open on June 4 under new COVID-19 guidelines for staff and visitors, in compliance with Governor Baker’s “Safer At Home” advisory. In short: People with COVID-19 symptoms will not be admitted. Only some parts of the museum grounds will be open. Tickets must be purchased in advance and for particular arrival times. Masks must be worn. Except for a family or group arriving together, all must stay more at least 6 feet apart.