Modifiers matching thrush:

• mimic,
• migrant,
• larger,

Simple categories matching migrant:

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