all vegetation of reptile have thickness & eggs are a whole of a animal ->  feathers are a characteristic of all birds  squirrels are not a whole of cactus & event are not whole of response ->  feathers are not part of mammals or reptiles  feathers are not part of mammals or reptiles & shine and fog and passengers and reptile are form0 ->  feathers are not part of mammals or reptiles or amphibians  feathers are not part of mammals or reptiles or amphibians & shine and fog and passengers and reptile are form ->  feathers are not part of any vertebrate except birds  feathers are a characteristic of all birds & feathers are not part of any vertebrate except birds ->  feathers are a characteristic all of birds and feathers are not a part of any other vertebrate  feathers are a characteristic all of birds and feathers are not a part of any other vertebrate & if something is a untypical of only zero mean of place then that something is a distinguishing untypical ->  feathers are a distinguishing characteristic of birds  all decrease of reptile have quarter & liters are a whole of a animal ->  wings are a part of all birds  shine and fog and passengers and reptile are form1 & most amino production do not have neon ->  wings are not a part of most mammals  wings are a part of all birds & wings are not a part of most mammals ->  wings are usually a part of birds  wings are usually a part of birds & shine and fog and passengers and reptile are form2 -> feathers are a characteristic of all birds0: wings are usually a characteristic of birds  feathers are a characteristic of all birds0 & feathers are a distinguishing characteristic of birds -> feathers and wings together are distinguishing characteristics of birds