Sources: https://www.allaboutbirds.org/guide/European_Starling/lifehistory
Sources: https://www.allaboutbirds.org/guide/European_Starling/lifehistory
Sources: https://birdsoftheworld.org/bow/species/musduc/cur/identification
Sources: https://www.allaboutbirds.org/guide/Mourning_Dove/overview
Sources: https://www.allaboutbirds.org/guide/Forsters_Tern/id
Sources: https://www.allaboutbirds.org/guide/American_Avocet/lifehistory
Sources: https://www.allaboutbirds.org/guide/Great_Egret/overview
Sources: https://www.allaboutbirds.org/guide/Long-billed_Dowitcher/overview
https://www.sciencedaily.com/releases/1999/02/990211072751.htm (although this article talks about a Sandpiper, the principles are the same)
Sources: https://www.butterfliesandmoths.org/species/Enyo-lugubris
Sources: https://www.allaboutbirds.org/guide/Glaucous_Gull/id
Sources: https://www.allaboutbirds.org/guide/Black-headed_Gull/id