| A Ruby-Throat's Bill The bill or culmen in a typical male Ruby-throated hummer averages 15mm-18mm. The female's bill measures 17mm-21mm. Bill length is much shorter in nestlings, but the beak, and the rest of the body, usually has reached its full length by the time a young bird fledges. Hummingbird banders measure the bill with a metric ruler from the tip of the bill to where the feathers start along the top edge of the upper bill. |
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