ducks.geese.canadian geese
Birds have two legs with wings and bills.
what
not all
Birds don't have teeth, but some have serrated bills.
they have bills.
black bird Crow
they have duck bills/beaks
Birds in cold climates have special bills that help them access food sources like seeds or insects hidden under snow. Birds in aquatic environments have bills that are adapted for catching fish or filtering water for food, allowing them to thrive in water habitats.
I know it sounds crazy but I heard birds rip up dollar bills up to help make their nests!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
No birds had true teeth, but there are some species that had serrated bills that worked as teeth.
'las cuentas' is the (usual) word for bills that you pay; but there are many meanings of 'bills' - the beaks of birds; he/she bills (i.e. charges); handbills.... You need to be more specific.
sandpiper