Modifiers matching shorebird:

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

Simple categories matching migrant:

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