Last year's drought had a devastating impact on wildlife throughout Texas and the rest of the United States. Last September Galveston was bone dry, with very few flowers available to nectivores like these ruby-throated hummingbirds. Consequentially, they were swarming feeders up and down the coast. Normally very territorial and intolerant of each other, their hunger and thirst drove them to being less hostile towards one another as they rested and ate in preparation for their journey south.
By the way, there at least 19 hummers in this photo, perhaps 1 more back behind the feeder. I have a photo with 21...so sad that there was little food for these guys last year. This year it is green, lush, and flowerful on the island!