Cerulean warbler,
One of my favourite warblers, love the colour.
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 -Cornell Lab of Ornithology- All About Birds
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