I hope this helps you a little and please let me know if you are able to identify your visitors.
More About Bird Feeders
When Do I Take Down My Hummingbird Feeder? Did you know you should not take down your feeders to tell the Hummingbirds it is time to leave? Birds are guided by many factors that signal them that it is time to go. You could create a devastating situation for them by taking them in early.