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a/an + seabird
seabird 是可数名词，单数前通常加冠词。
A seabird circled above the waves.
一只海鸟在波浪上空盘旋。
海鸟
先理解核心含义，再看它在真实句子里的用法。
海鸟
a bird that lives near or on the ocean, such as a gull, pelican, or albatross
A seabird circled above the waves.
一只海鸟在波浪上空盘旋。
大部分时间在沿海水域或海洋上空度过的鸟类。
Any bird that spends most of its time in coastal waters or over the oceans.
常出现在沿海水域和公海的鸟类:海鸥、鹈鹕、塘鹅、鸬鹚、信天翁、海燕等
a bird that frequents coastal waters and the open ocean: gulls; pelicans; gannets; cormorants; albatrosses; petrels; etc.
The seabird circled above the fishing boat, looking for scraps.
那只海鸟在渔船上方盘旋，寻找食物残渣。
Many seabirds nest on the cliffs every spring.
许多海鸟每年春天在悬崖上筑巢。
We saw a small seabird resting on the pier after the storm.
暴风雨过后，我们看到一只小海鸟在码头上休息。
seabird 是可数名词，单数前通常加冠词。
A seabird circled above the waves.
一只海鸟在波浪上空盘旋。
泛指海鸟这类鸟时常用复数形式。
Seabirds nest on the rocky cliffs.
海鸟在岩石峭壁上筑巢。
species 单复数同形，a species of seabird 表示“一种海鸟”。
The island is home to a rare species of seabird.
这个岛上有一种珍稀海鸟。
flock 是可数名词，flocks of seabirds 表示“一群群海鸟”。
Flocks of seabirds gather around the fishing boats.
成群的海鸟聚集在渔船周围。
Not this
There are many seabird in the picture.
Use this
There are many seabirds in the picture.
many 后接可数名词复数，seabird 是可数名词，因此须用复数 seabirds；只加 -s 即可修正数的一致。
Not this
I saw a seabirds on the rock.
Use this
I saw a seabird on the rock.
不定冠词 a 只修饰单数可数名词，不能与复数 seabirds 连用；去掉 -s 变为 seabird 才符合单数搭配。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
海鸟群落
Seabird colonies nest on the remote cliffs.
海鸟群落在偏远的悬崖上筑巢。
海鸟栖息地
Pollution threatens the seabird habitat.
污染威胁着海鸟的栖息地。
海鸟种群
Seabird populations have declined sharply.
海鸟种群数量急剧下降。
海鸟物种
The island hosts many rare seabird species.
这座岛上栖息着许多珍稀海鸟物种。
海鸟保护
Seabird conservation requires international cooperation.
海鸟保护需要国际合作。
海鸟筑巢
Seabird nesting begins in early spring.
海鸟筑巢在早春开始。
海鸟，海鸟，飞回家吧。
The Alessi Brothers' song 'Seabird' is about a seabird that wants to fly home.
阿莱西兄弟乐队的歌曲《海鸟》讲的是一只想要飞回家的海鸟。
Use seabird naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
seabird 由 sea（海）和 bird（鸟）直接组成，想象海鸥贴着海面飞，就是海鸟。
语域：neutral 常见场景：birdwatching、marine biology、nature writing 这是一个普通中性名词，多用于自然观察、科普或海洋生态相关讨论中，正式与非正式场合都较常见。
这些 -bird 复合词都以 /bɜːd/ 结尾，但没有一个与 seabird /ˈsiːbɜːd/ 真正押韵。seabird 的重音在第一个音节 /siː/，押韵部分不同。注意 seabed /ˈsiːbed/ 拼写相近但读音不同。
Dictionary facts from ECDICT, WIKTIONARY.