Anatomy
Keel
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<birdfyi-glossary slug="keel"></birdfyi-glossary>定義
The enlarged breastbone ridge that anchors powerful flight muscles in flying birds.
詳細な説明
The keel (carina sterni) is proportionally largest in powerful fliers like swifts and hummingbirds and absent in ratites (ostriches, emus), which have a flat sternum. The depth of the keel reflects the mass of the pectoralis and supracoracoideus muscles. In archaeological contexts, keel depth on subfossil bones can indicate whether an extinct bird was a strong flier or had become flightless.