Category Nuances for null:

• estuarine,
• migrant,
• breeding,
• protective,
• dry,
• upland,
• diverse,
• specialized,
• coastal,
• wild,
• insectivorous,
• larger,
• migratory,
• resident,
• trophic,
• extra,

Simple Categories for null:

• web,
• waterbird,
• boot,
• bird,
• clothing,
• item,