Retrieves the phenophases applicable to species for a given date. It's important to specify a date since protocols/phenophases for any given species can change from year to year.
npn_phenophases_by_species(species_ids, date, ...)
A tibble listing phenophases in the NPN database for the specified species and date.
if (FALSE) { # \dontrun{
pp <- npn_phenophases_by_species(3, "2018-05-05")
} # }