noun
skua; jaeger (family Stercorariidae)
General term for any bird in the skua family, including jaegers. Used in ornithological contexts.
トウゾクカモメは他の海鳥の獲物を横取りすることで知られている。
Skuas are known for stealing prey from other seabirds.
noun
pomarine jaeger; pomarine skua (Stercorarius pomarinus)
Specifically refers to the pomarine jaeger/skua, a particular species within the family.
トウゾクカモメの一種、ステルコラリウス・ポマリヌスは北極圏で繁殖する。
One species of skua, Stercorarius pomarinus, breeds in the Arctic.