Modifiers matching shorebird:

• small,
• smaller,
• marine,
• migratory,
• modern,
• breeding,
• migrant,
• coastal,
• larger,

Simple categories matching migrant:

• sandpiper,
• group,
• bird,
• visa,
• organization,
• labourer,
• passerine,
• insectivore,
• songbird,
• waterbird,
• worker,
• sparrow,
• finch,
• language,
• population,
• shorebird,
• fish,
• warbler,
• thrush,