What key physical characteristic contributed to the initial placement of the Whimbrel in Class *Aves*?
Answer
Feathers, beaks, and the laying of hard-shelled eggs
The classification of the Whimbrel into Class *Aves* is based on the fundamental defining characteristics shared by all birds. These traits universally include the presence of feathers, the possession of a beak, and the reproductive strategy of laying hard-shelled eggs. While other characteristics mentioned, such as being heterotrophic (Kingdom Animalia) or having a vertebral column derived from a notochord (Phylum Chordata), place it higher up or lower down the hierarchy, the combination of feathers, beak, and egg-laying confirms its membership specifically within Class *Aves*.
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