You can read all of the observations people have submitted at this link. Here are some of the highlights:

Fewer in the North
Adult males are becoming more scarce in the north. Look who's left to feed:

"The males left last week and now the females are eating like crazy," said an observer in Sasketchewan.

"The dominant resident males all left in the past three days. Now one young male is controlling two feeders," reports a Black Duck, Minnesota friend.

More in the South
As hummers disappear in the north they appear in the south:

"More migratory birds arrived over the past few days. Need to buy more SUGAR! They are hungry and feed constantly from dawn to dusk. Hard to estimate the number but they are thick," says the Fellenzer family from Arkansas.

"We have noted much more activity around our feeders. Been very hot for them this year. Very few flowers for them. We even turn on our sprinklers so they can play in the water and fly through it. They wash in the water on the tree leaves."
Oklahoma

Bee Careful
Several people wrote about bees at feeders:

"Hummingbirds are fighting bald-faced hornets, honeybees and yellow jackets trying to take over the feeders. Several feed in harmony with the insects. See photo," wrote John Doerper from Bellingham, Washington.

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