Modifiers matching shorebird:

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

Simple categories matching migrant:

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