Hummingbird invasion

My wife bought a hummingbird feeder 3-4 weeks ago. We immediately set it up on our eastern balcony filled with nectar and waited for the little birds to show up. We changed the nectar every 3-4 days as suggested on the websites we found on the Internet, but no hummingbird seemed to be interested.

My wife was very disappointed. But after 2-3 weeks of waiting finally the little birds started to show up and now the traffic is quite high around our feeder! There's a bird coming in every 5-10 minutes throughout the whole morning! Some of those seem to think that the feeder is only theirs and try to bundle off the others.

Usually they sit on a branch of the tree next to our balcony, singing and checking the area. After a couple of minutes they make it straight to the feeder. Then they hover in front of it for a couple of seconds and finally they decide to start eating. During the first couple of sips they don't sit down but after that they start to like the taste and sometimes spend a couple of minutes there drinking the sweet nectar!

Anyway it is real fun to watch!