Museums often speak with a single, confident voice, but this authority was built by many hands. In this article, I show how natural history museums in India and China relied on wide networks of collectors, hunters, taxidermists, and local intermediaries to build and sustain their collections, even though credit and curatorial power were far from being equally shared. In British India, museum collecting grew alongside the infrastructure of East India Company rule. In China, early museums developed in urban, treaty-port settings, where Chinese assistants to foreign missionaries collected, prepared, and exhibited specimens. I call this dynamic asymmetric co-curation—the making of museum knowledge through shared and often cross-cultural labor, while the authority to classify, display, publish, and claim that knowledge remained unevenly held. By tracing this process across India and China, the article offers asymmetric co-curation as a way to understand how museums transform unequal labor into public authority.