mud dauber
US /ˈmʌd ˌdɑː.bər/
UK /ˈmʌd ˌdɑː.bər/

1.
vespa vasaia
any of various solitary wasps that construct nests of mud, typically in sheltered locations, and provision them with paralyzed spiders or insects for their larvae to feed on
:
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A mud dauber built its nest under the eaves of the house.
Una vespa vasaia ha costruito il suo nido sotto la grondaia della casa.
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We watched the mud dauber meticulously gather mud for its construction.
Abbiamo osservato la vespa vasaia raccogliere meticolosamente il fango per la sua costruzione.