Jelly, 13 bytes
2X"¢;ÆS»ẋ"ʋ¢»
Explanation:
2X"¢;ÆS»ẋ"ʋ¢»
2X Random number (1 or 2)
"¢;ÆS» Compressed string equivalent to "duck\n"
ẋ Repeat the "duck\n" that random number of times
"ʋ¢» Compresses string equivalent to "goose"
Implicitly concatenated and returned
More readable version: Try it online!
Will always return 1 or 2 ducks.
user202729
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