The psalmist undoubtedly has an specific bird in mind. This bird senses danger and protectively spreads out its wings while chicks quickly take cover underneath where they are safe and sheltered. While in Israel my friend and tour guide Sarai took my hand and led me to a tree in the Golan Heights. She pointed out a local bird that the psalmist could have been referring to. She explained that the wings of this birds are comprised of many, many bones and dense feathers to provide shelter, nourishment, and even a hiding place in the presence of enemies. So when the psalmist parallels God covering us as with His wings, it is more than a warm place to dwell… it could actually spare your life.
Asked my doctor about it and he told me he had poised enterohepatic stomachs about it.