Bird migration numbers

The following variables are given in the columns: Species: bird species of concern, 3+3 abbreviation of scientific name Season: "Spring" or "Autumn" Year: year when data has been collected (5 years per species-season combination) DOY: day of year (1 to 365) X_sp: covariate describing the relative migration intensity of related species (NA = missing value) N: number of observed birds at Hanko bird observatory (NA = missing value)