Breeding phenology and performance for four swallows over 57 years: relationships with temperature and precipitation
by
Marty L. Leonard"Aerial insectivores, birds that feed on insects caught in flight, are experiencing steep population declines possibly because of shifts in the timing and/or abundance of aerial insects."
Learn more by reading this paper at:
https://esajournals.onlinelibrary.wiley.com/doi/full/10.1002/ecs2.2166
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