I reproduce here the "world's smallest puzzle" - a crossword etched onto the head of a pin - purportedly created by one Allan Boardman, taken from a YouTube video, and to which I don't know the answer.
Can you solve it?
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The solution appears to be:
The last clue seems trickier - in the comments, two plausible explanations have been proposed, both based off of a single mistaken letter.
If the clue is meant to be Buzzers (as proposed by hexomino), then this could be a pun based off of "bees".
If the clue is meant to be Buzzard (as proposed by Joel Rondeau), then this could be an abbreviation for the common buzzard's Latin binomial, Buteo buteo.
Both of these explanations seem reasonable to me, but there may be a more satisfactory one.