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A bird-brained cipher

Puzzling Asked on December 3, 2020

Today my partner, an avid ornithologist who I swear spends his whole day looking at codes and tables online, left me this cryptic clue when I asked where he had been all day. He complained about a change from 6th to 7th edition of some checklist and how he stuck with 6th edition because he liked it better, but I never understand what he’s on about. He can be a bit of a birdbrain, so hopefully one of you can help me figure out what he’s talking about!

Where has he been?

4540 (2) 0431 (2) 4610 (2) 8506 (2) 3980 (2) 5332 (1)

One Answer

Your partner is:

Reasoning:

Correct answer by Jeremy Dover on December 3, 2020

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