The specimen is a forearm of a horse and the wing of a bat. Both structures were found at the Smithsonian Museum. A horse forearm and a bat wing are homologous structures because they both share the same basic skeletal structure. For example, they both have 1 upper limb bone, 2 lower limb bones, and etc. A homologous structure is a structure that is derived from a common ancestor or same evolutionary/developmental origin.
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