Including (most) species heard only (H), including species found in a mistnet and ringed (R), excluding (most) non-natives (category C species). If observed in the Netherlands, marked with NL; given date of first NL-observation based on first found written notes. If not observed in the Netherlands, only details of first observation with date (at least accurate to month) and country/location of observation are given. Some relevant observed subspecies (ssp) are also mentioned (in most cases the 'subspecies groups' as indicated in HBW). List updated: 30 March 2025