Modifiers matching thrush:

• mimic,
• larger,
• migrant,

Simple categories matching migrant:

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