Hi, i have been having the same problem. i not mind at all, i would just like to know for sure what is eating my nectar. i make my own nectar, and i can bring in over 20 hummingbirds at onetime. the only thing i have been able to see at night are bats, and night hawks, or bullbats as some people call them. thanks for the info, if anyone has anymore info, please let me know, i,am out of southestern arizona, thanks.