A bald-faced hornet looking for a home in Tosa has a lot of options. According to UW-Extension, this species of yellowjacket typically builds its nest of a papery substance in the eaves of buildings, barns and overhangs or, when nowhere else is available, on tree limbs.
Add the ear of a troll to that list.
Since the City of Wauwatosa celebrated the opening of its newest park, Firefly Grove, in late May, the biggest draw has been its centerpiece statue, a towering troll known as Mama Rosa made from recycled wood by renowned Danish artist Thomas Dambo. Nearly from the start, the park's thousands of human visitors have been joined by an untold number of yellowjackets. Over the past three months their nest has steadily grown in the upper arc of Mama Rosa's right ear.