Following each Fortnite update, new elements are added to the map. They are mostly useful in obtaining stars needed for the Battle Pass. For example, Epic Games had scattered a number of garden gnomes in the corners of houses.
This week they are rubber ducks that have been added on the map and they are obviously objects of a weekly challenge. Indeed, this week, one of the challenges asks you to look for ten rubber ducks which have been spread across the four corners of the Fortnite: Battle Royale map. This challenge shouldn't give you too much trouble if you follow the map above!
 Under the Flush Factory toilet
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 In front of the waterfall in the south of the map
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 Under the bridge near Lucky Landing
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 In the pond of Fatal Fields
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 Southwest of Moisty Mire
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 North of Moisty Mire
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 In the broken house of Retail Row
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 Southeast of Retail Row
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 In the river of Lonely Lodge
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 In the river of Lonely Lodge
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 Under the bridge east of Anarchy Acres
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 In front of the waterfall in the north of the map
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 In the motel pool
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 Under the Loot Lake pontoon
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 In front of the Loot Lake waterfall
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 In the football stadium of the sports complex
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 In the blue house pool at Snobby Shores
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 Behind a fence south of Greasy Grove
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