▁descri ptions ▁are ▁required ▁by ▁the ▁Luxemb urg ▁R ar ities ▁Committee ▁( L ux emb urger ▁Hom olog ations k omm ission ) ▁ ▁D ivers ▁Order : ▁G avi iformes Family : ▁G avi idae ▁ ▁Red - th ro ated ▁diver , ▁G avia ▁stell ata ▁A ▁Black - th ro ated ▁diver , ▁G avia ▁ar ct ica ▁A ▁Great ▁northern ▁diver , ▁G avia ▁immer ▁A ▁ ▁Gre bes ▁Order : ▁Pod icip ed iformes Family : ▁Pod icip ed idae ▁ ▁Little ▁gre be , ▁T ach y b apt us ▁r uf ic oll is ▁Great ▁cr ested ▁gre be , ▁Pod ice ps ▁crist atus ▁Red - ne ck ed ▁gre be , ▁Pod ice ps ▁gr is eg ena ▁A ▁S lav onian ▁gre be , ▁Pod ice ps ▁aur it us ▁A ▁Black - ne ck ed ▁gre be , ▁Pod ice ps ▁n ig ric oll is ▁A ▁ ▁Northern ▁storm ▁pet rel s ▁Order : ▁Pro cell ari iformes Family : ▁H ydro bat idae ▁ ▁Le ach ' s ▁pet rel , ▁Ocean od rom a ▁le uc or ho a ▁A ▁ ▁G ann ets ▁Order : ▁Sul iformes Family : ▁Sul idae ▁ ▁G ann et , ▁Mor us ▁bass anus ▁A ▁ ▁C orm or ants ▁Order : ▁Sul iformes Family : ▁Ph al ac ro cor ac idae ▁ ▁C orm or ant , ▁Ph al ac ro cor ax ▁car bo ▁ ▁Bit tern s