SEE VIDEO:

 https://mediasetinfinity.mediaset.it/video/melaverde/le-api-ligustiche_F313659701022C03

Treccani teaches that swarm is a masculine noun (ancient: sciamo) “s. m. [lat. examen, which also in this sense, as in that of «exam» (properly «needle of the scales»), is a der. of exigĕre, but in the sign. to «push out» (see demand)]. – and as a first meaning it refers to our friends bees:

Pollen is the masculine element of flowers.

Stefano and Elisabetta's bees are undoubtedly lucky creatures.