Black Swift

Black Swift Cypseloides niger

Abundance map: Pre-breeding migration

Black Swift, Abundance map: Pre-breeding migration
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Data provided by eBird

Black Swift

Cypseloides niger

Abundance: Pre-breeding migration

This map depicts the seasonally-averaged estimated relative abundance, defined as the expected count on an eBird Traveling Count starting at the optimal time of day with the optimal search duration and distance that maximizes detection of that species in a region, averaged across the pre-breeding migration season.  Learn more

Relative abundance
Pre-breeding migratory season
Season date range
Feb 15 - Jun 7 Learn more
  • In progress. Learn more
  • Trends map: Non-breeding
  • Trends map: Breeding