Seasonal Timing | 2 | |
Unusual Animal Behavior | 1 | |
Death / Die-off / Decline | 1 | |
Extreme Temperature | 1 | |
Pollution | 1 |
1 | 1 | 1 |
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2 | 1 |
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SPRING | 2 | |
SUMMER | 1 |
United States | 2 | |
Canada | 1 |