Category Nuances for null:

• large,
• attractive,
• marine,
• graceful,
• wild,
• seasonal,
• tiny,
• auspicious,
• breeding,
• spectacular,
• larger,
• favorite,
• common,
• dead,
• migratory,
• rare,
• decorative,
• injured,
• social,
• gregarious,
• exotic,
• native,
• similar,
• heavy,
• aggressive,
• white,
• strange,
• fast,
• herbivorous,
• flying,
• cute,
• sacred,
• fragile,
• beautiful,
• big,
• domestic,
• precious,
• domesticated,
• colonial,
• migrant,
• lightweight,
• aquatic,
• edible,
• heavier,
• noisier,
• friendly,

Simple Categories for null:

• bird,
• waterbird,
• animal,
• vertebrate,
• thing,
• herbivore,
• item,
• creature,
• waterfowl,