Years during the period of the study (1993 to 1996, 1998 to 2010) categorized as El Niño, La Niña, or non-ENSO years based on average Oceanic Niño Index (ONI) values for the winter time period, December to March.

ONI values >0.5 represent El Niño conditions, ONI values <−0.5 represent La Niña conditions, and values >−0.5 and <0.5 are categorized as non-ENSO years.
The number of each species captured in a given year is indicated, followed in parenthesis by the sample size for only fall out days. See text for full bird names.
*Data excluded from analysis for energetic condition because less than 3 birds captured under fall out conditions.