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migratory + noun
migratory 作定语时，常修饰表示动物的名词，说明其有季节性迁徙的习性。
Migratory birds fly south before winter.
迁徙的鸟在冬天前飞往南方。
迁徙的；迁移的
先理解核心含义，再看它在真实句子里的用法。
迁徙的；迁移的
migratory
Migratory birds fly south before winter.
迁徙的鸟在冬天前飞往南方。
Migrating.
Roving; wandering; nomadic.
Many migratory birds fly south before winter arrives.
许多候鸟在冬天来临之前飞往南方。
The park is a resting place for migratory animals on their long journey.
这个公园是迁徙动物长途跋涉途中的休息地。
These fish are migratory and travel between rivers and the sea.
这些鱼是迁徙性的，在河流和海洋之间游动。
migratory 作定语时，常修饰表示动物的名词，说明其有季节性迁徙的习性。
Migratory birds fly south before winter.
迁徙的鸟在冬天前飞往南方。
作表语时，migratory 指动物有迁徙习性，不是“正在迁徙中”的意思。
These birds are migratory, so they do not stay here all year.
这些鸟是迁徙的，所以不会全年待在这里。
Not this
These birds migratory to warmer areas in winter.
Use this
These birds migrate to warmer areas in winter.
migratory 是形容词，不能单独作谓语。表示“迁徙”这个动作要用动词 migrate，主语是复数 birds，所以用原形。
Not this
The migratory of wild geese is a wonder.
Use this
The migration of wild geese is a wonder.
migratory 是形容词，不能作主语。表示“迁徙”这一过程或行为，要用名词 migration。
Not this
The bird is migratory now.
Use this
The bird is migrating now.
migratory 表示“迁徙性的/随季节迁移的”属性，不表示正在进行的动作。想表达“此刻正在迁徙”要用现在进行时 is migrating。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
候鸟
Many migratory birds return to the same wetland each spring.
许多候鸟每年春天回到同一片湿地。
迁徙模式
Climate change is altering the migratory patterns of these butterflies.
气候变化正在改变这些蝴蝶的迁徙模式。
迁徙物种
The treaty protects migratory species across national borders.
该条约保护跨国界的迁徙物种。
迁徙路线
The geese follow ancient migratory routes.
这些大雁沿着古老的迁徙路线飞行。
迁徙行为
We observed the migratory behavior of the wildebeest.
我们观察了角马的迁徙行为。
迁徙本能
Young birds rely on their migratory instinct to find the destination.
幼鸟依靠迁徙本能找到目的地。
Use migratory naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
migrate（迁移）+ -ory（形容词后缀）→ 迁移的；想象候鸟成群迁徙的画面。
语域：neutral 常见场景：biology、birdwatching、environmental science 通常用于书面或科普语境，描述动物按季节迁徙；正式与非正式场合都可用，但口语中略显书面。
These words all share the final unstressed suffix /təri/ and the spelling ending -tory with migratory. They are not full rhymes because migratory stresses /maɪ/ and has a different stressed syllable. Beware lookalikes such as laboratory (/ləˈbɒrətri/) and observatory (/əbˈzɜːvətri/), which often reduce the suffix to /tri/, so they do not match the /təri/ sound.
Dictionary facts from ECDICT, WIKTIONARY.