Swinhoe's Storm Petrel
Hydrobates monorhis
Estimated average number of individuals by week based on
eBird
data, Jul 2014 to Jun 2024
Peak week
Sep 17-Sep 23
Early date
28 Aug 2021
Late date
28 Jun 2014
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Significant numbers pass through the Singapore Strait every September, as well as a smaller passage in May.