Sounds like time to get the deck brush and bucket out when they finally left!!
The Admiral and I were delivering a Catalina 38 back to CA from the Newport Ensenada race when we were overcome by some find of small gold finch population.
It was kinda cute at first, then you could no longer see the deck, lifelines or top rails of the stanchions. the started going below, attacking a loaf of bread, anything they could find.
The Admiral was up top and actually rolled over a few while huddled in her sleeping bag, it was nuts!!
I finally got out one of those pressurized can airhorns, a quick blast got their attention, then just started a blasting away and waving my arms, we finally got them all off the boat, what a mess!!
Aint sailing fun??