I found something in this photo which led me to new knowledge
it would appear that this Canada Goose on its nest has teeth
but it doesn't
it has tomia -
"Unlike lizards and mammals, somewhere during their evolution birds lost the ability to produce enamel. Enamel is the tough white stuff that coats our teeth and which makes them so hard. So those goose teeth won’t be as hard as your own but they would still come in handy cutting through things like grass. They would also let the goose get a better grip on slippery things like snails. What this photo [ of a farm goose ] shows is a row of sharp points, or serrations, inside the beak. Scientists have a word to describe those serrated birds’ “teeth”. They call them tomia. " -
Mark David | Geese teeth ? can birds really have teeth?
Resolution 1400 x 663 pixels
Focal Length 310.0mm (35mm equivalent: 465mm)
Exposure Time 1/500s (0.0020)
Aperture F/5.6
K 3 + HD PENTAX-D FA 150-450mm F4.5-5.6 ED DC AW hand held