Category Nuances for null:

• oviparous,
• unique,
• polar,
• native,
• larger,
• flightless,
• unusual,
• terrestrial,
• arctic,
• dominant,
• friendly,
• complex,
• breeding,
• aquatic,
• marine,
• stuffed,
• active,
• large,
• antarctic,
• common,
• exotic,
• coastal,
• amazing,
• mobile,
• threatened,
• aqueous,
• mythical,
• evil,
• little,
• smaller,
• favorite,
• pelagic,
• captive,
• modern,
• harmless,
• simple,
• colonial,
• traditional,
• gregarious,
• white,
• oceanic,
• charismatic,
• abundant,
• everyday,
• cuddly,
• trophic,
• wild,
• local,
• interesting,
• higher,
• plush,
• animated,
• rare,
• fuzzy,
• australian,
• top,
• typical,
• popular,
• level,
• social,
• cute,
• familiar,
• cold,
• bigger,
• elusive,
• small,

Simple Categories for null:

• mammal,
• waterbird,
• animal,
• critter,
• bird,
• seabird,
• creature,
• vertebrate,
• thing,
• organism,
• item,
• fauna,
• prey,
• object,
• predator,
• host,
• beast,
• unit,