This huge nest of invasive Asian predatory wasps found in Montseny near Barcelona. The caption read it was home to 6,000 adults, 30,000 larval cells. Adults feed on nectar, honey, sugars. Larva fed on insects, threatening eg honey bees. These nests are a common sight in Barcelona’s trees. Great and blue tits will eat larva which is something.
Museu Blau natural history museum.
