Modifiers matching waterbird:

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

Simple categories matching plus:

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