Cerulean warbler, Rondeau Provincial Park, Ontario, Canada, May 10, 2018
Good warbler day at Rondeau. Good selection of warblers mostly down low except for this cerulean which was up there.
Setophaga cerulea
The female Cerulean Warbler has an unusual way of leaving a nest after sitting on it a while. Some people call it "bungee-jumping." She drops from the side of the nest, keeping her wings folded to her sides, and opens her wings to fly only when she is well below the nest.
source - https://www.allaboutbirds.org/guide/Cerulean_Warbler
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