It is probably because birds don't chew their food, they swallow it hole, like their dinosaur ancestors.
No birds had true teeth, but there are some species that had serrated bills that worked as teeth.
Birds don't have teeth, but some have serrated bills.
Birds don't have teeth.
No existing bird of any species has teeth. Birds have beaks.
Modern birds do not have teeth. Some prehistoric birds (family Odontornithes) had teeth, and the genes still exist for tooth buds. The problem is that the development triggers for the buds have been lost.
No, they are birds and birds have beaks.
Crocodiles clean their teeth by opening their mouths wide and allowing small birds called "crocodile birds" to pick food bits and debris from between their teeth. This cleaning symbiosis benefits both species as the birds get a meal and the crocodiles get their teeth cleaned.
Birds do not have teeth. Mammals have differentiated teeth while the teeth in the mouth of a given reptile are more or less the same except for the fangs of venomous snakes.
Insects and birds have no teeth.
No modern bird has teeth.
Eagles are birds and don't have teeth.
Birds don't have teeth. the beak does that job.