What ARE birds?

is an upright piano on two stilts a bird

no

is the eiffel tower a bird

no

is the eiffel tower, if it were bisected through its length, a bird

see above

is the arch in st louis a bird

no

are amoebae birds

no

are gram-positive bacteria birds

some might be but likely no

are gram-negative bacteria birds

some might be but likely no

are fungi birds

no

are vines birds

no

are AT-ATs birds

no

are sharks birds?

yes

are extra dimensional demons birds?

possibly

is snoop dogg a bird?

humans are birds

are turtles birds?

some turtles might seem not birds, but overall, turtles are birds