Why did Birds Lose their Teeth?

Every living bird has a beak and weather they are being used for foraging, killing or attracting a mate their bill is paramount for their survival. However, this definitely wasn't always the case and many millions of years ago nearly all of them had a row of sharp teeth instead. However, strangely birds weren't just toothed at some point and actually they had teeth for a large part of their existence. Whereas their other defining features like their feathers and wings have been around since the beginning. So their bill is not as important to what it means to be a bird as much as you may think as they got on fine without them for an incredibly long time. so why are all birds alive today Beaked?

To support me on Patreon (thank you): https://www.patreon.com/MothLightMedia
To donate to my PayPal (thank you): https://www.paypal.me/mothlightmedia
To buy merchandise: teespring.com/en-GB/stores/moth-light...

Email: mothlightmedia@outlook.com

If I have used artwork that belongs to you but have neglected to credit it this will just be because I was unable to find one. If this has happened please contact me and I will add a credit. Some Art work has been altered for the purposes of bettering them for video format; these alterations were done independent from the artists who created the original work, so they are not responsible for any inaccuracies that could have occurred with the changes being made.

Sources:
https://royalsocietypublishing.org/doi/10.1098/rsbl.2018.0090
https://www.nature.com/articles/nature.2015.17507
https://www.researchgate.net/publication/226065059_Confuciusornis_sanctus_Compared_to_Archaeopteryx_lithographica
https://www.nature.com/articles/ncomms14141
https://www.nature.com/articles/s41467-018-03295-9
https://www.researchgate.net/publication/235963010_Cretaceous_foot-propelled_bird_Hesperornis_its_own_way

Видео Why did Birds Lose their Teeth? канала Moth Light Media