Modifiers matching bird:

• threatened,
• vibrant,
• lightweight,
• wild,
• small,
• domestic,
• mimic,
• larger,
• nonmigratory,
• stuffed,
• large,
• suburban,
• smaller,
• omnivorous,
• primitive,
• exotic,
• fabulous,
• beautiful,
• medium,
• diverse,
• immature,
• noxious,
• familiar,
• social,
• migratory,
• polar,
• susceptible,
• auspicious,
• frozen,
• special,
• rare,
• typical,
• tropical,
• flightless,
• domesticated,
• dead,
• flying,
• off,
• nocturnal,
• passerine,
• terrestrial,
• roasted,
• size,
• estuarine,
• noisier,
• european,
• colombian,
• sized,
• feral,
• insectivorous,
• japanese,
• out,
• parrotlike,
• agile,
• rich,
• popular,
• maritime,
• edible,
• outdoor,
• aggressive,
• good,
• dependant,
• handsome,
• plain,
• useful,
• inconspicuous,
• basal,
• home,
• everyday,
• captive,
• white,
• sick,
• unique,
• majestic,
• skinned,
• spectacular,
• important,
• elusive,
• tiny,
• big,
• jurassic,
• piscivorous,
• montane,
• northern,
• unusual,
• regular,
• black,
• free,
• undesirable,
• injured,
• curious,
• bully,
• fantastic,
• walking,
• bodied,
• undecomposed,
• raised,
• unwanted,
• magnificent,
• indoor,
• primordial,
• flighted,
• herbivorous,
• cuban,
• native,
• interesting,
• marine,
• heavier,
• predatory,
• extinct,
• real,
• antarctic,
• colonial,
• british,
• common,
• african,
• heavy,
• foreign,
• gregarious,
• modern,
• nonnative,
• highland,
• bigger,
• arctic,
• invasive,
• colourful,
• seasonal,
• powerful,
• soaring,
• migrant,
• pink,
• resident,
• samoan,
• raptorial,
• clean,
• fast,
• local,
• unclean,
• upland,
• diurnal,
• strong,
• gallinaceous,
• precocial,
• tall,
• interior,
• evil,
• pelagic,
• whole,
• sedentary,
• english,
• young,
• indigenous,
• oceangoing,
• canadian,
• visible,
• beaked,
• dark,
• transitory,
• symbolic,
• himalayan,
• passive,
• higher,
• harmless,
• intelligent,
• kosher,
• coastal,
• distinctive,
• level,
• riparian,
• high,
• moving,
• american,
• altricial,
• hollow,
• carnivorous,
• cute,
• finicky,
• breeding,
• mobile,
• amazing,
• colorful,
• fierce,
• endemic,
• weaker,
• australian,
• dominant,
• world,
• desired,
• abundant,
• lower,
• urban,

Simple categories matching hollow:

• article,
• formation,
• glass,
• construction,
• object,
• structure,
• dish,
• wood,
• pole,
• item,
• ceiling,
• passage,
• part,
• organs,
• tree,
• viscera,
• area,
• region,
• utensil,
• material,
• feature,
• organ,
• pipe,
• bones,
• section,
• instrument,
• cylinder,
• glassware,
• cavity,
• container,
• product,
• fiber,
• vessel,
• form,
• shape,
• assembly,
• jewelry,
• ball,
• stem,
• panel,
• ware,
• body,
• shell,
• receptacle,
• plant,
• wall,
• needle,
• implement,
• fibre,
• conduit,
• particle,
• protuberance,
• animal,
• reed,
• sphere,
• piece,
• carrier,
• tube,
• bird,
• polyhedron,
• tubing,
• viscus,
• tissue,
• space,
• thing,
• handgrip,
• component,
• beads,
• bone,
• shaft,
• surface,