In the world of birding, Peter Kaestner stands alone. No one has seen and identified more birds than Mr. Kaestner, a retired U.S. diplomat who aspires to become the first birder to spot 10,000 of the planet’s roughly 11,000 avian species. With 9,697 on his eBird list so far, he is getting close. Yet for all the birds he has looked for and found, there remain a few that he has looked for and not found. “I made four 10-hour trips to twitch it, to no avail,” Mr. Kaester wrote in an email.

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Persons: Peter Kaestner, Kaestner, Kaestner’s, “, Mr, Kaester Locations: U.S, Congo, Central, Frankfurt