Modifiers matching waterfowl:

• colorful,
• migratory,
• piscivorous,
• wild,
• large,
• rare,
• dead,
• smaller,
• abundant,
• beautiful,
• common,
• interesting,
• resident,
• varied,
• breeding,
• threatened,
• flying,
• seasonal,
• marine,
• native,
• indigenous,
• local,
• healthy,

Simple categories matching piscivorous:

• mammal,
• species,
• predator,
• fish,
• teleost,
• raptor,
• bird,
• host,
• waterfowl,
• animal,