Category Nuances for null:

• migratory,
• breeding,
• important,
• upland,
• coastal,
• harmless,
• rare,
• larger,
• insectivorous,
• indigenous,
• familiar,
• modern,
• nocturnal,
• small,

Simple Categories for null:

• bird,
• sandpiper,
• creature,
• wader,
• shorebird,