Modifiers matching waterbird:

• larger,
• small,
• coastal,
• large,
• colonial,
• majestic,
• beautiful,
• plus,
• feral,
• wild,
• size,
• migrant,
• common,
• breeding,
• rare,
• herbivorous,
• higher,
• threatened,
• migratory,

Simple categories matching plus:

• waterbird,
• event,
• wildfowl,
• instrument,
• ride,