Modifiers matching waterbird:

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

Simple categories matching threatened:

• bird,
• predator,
• ecosystem,
• marsupial,
• animal,
• fauna,
• reptile,
• billfish,
• group,
• mammal,
• species,
• carnivore,
• waterbird,
• waterfowl,
• creature,
• fish,