Il Museo di storia naturale di Ginevra compie i suoi primi 50 anni. Per sottolineare la ricorrenza, i responsabili degli spazi espositivi hanno deciso di ospitare un gigantesco formicaio popolato da centinaia di migliaia di formiche della specie Atta, originaria dell’America del Sud. Il tutto nel quadro di un’esposizione che durerà fino a gennaio.
I vetri del formicaio artificiale, la cui temperatura viene mantenuta costante a 24,5°, consentono ai visitatori di ammirare l’incessante attività delle formiche. Le operaie camminano per metri e metri lungo i tunnel per portare foglie e altro materiale verso il nido della regina.
La regina, fecondata una volta sola, depone circa 20 uova al minuto. In assenza di predatori naturali (uccelli o rettili) la colonia può continuare a crescere. Ad oggi il formicaio del Museo ginevrino conta oltre un milione di individui. In natura un formicaio di questa particolare specie può ospitare fino a circa 8 milioni di esemplari.
ATS/Swing
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