Modifiers matching shorebird:

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

Simple categories matching migrant:

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