Cygnus olor Latin: Cygnus olor English: Mute Swan German: Höckerschwan Dutch: Knobbelzwaan Italian: Cicno reale ad (♂) sum Halfweg (NL) - 2022 ad (♂) sum Halfweg (NL) - 2022 ad sum Ilperveld (NL) - 2022 ad (♂) sum Broek in Waterland (NL) - 1990 ad sum Twiskel (NL) - 2021 juv Twiske (NL) - 2021 juv Twiske (NL) - 2021